A180681 - OEIS

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A180681 as a triangular array

										1
									3		3
								6		5		6
							10		16		8		10
						15		23		22		12		15
					21		47		44		30		17		21
				28		62		74		56		40		23		28
			36		104		115		114		71		52		30		36
		45		130		196		162		139		89		66		38		45
	55		195		268		286		227		169		110		82		47		55
66		235		395		407		369		269		204		134		100		57		66

A180681 as a square array

1	3	6	10	15	21	28	36	45	55	66
3	5	16	23	47	62	104	130	195	235
6	8	22	44	74	115	196	268	395
10	12	30	56	114	162	286	407
15	17	40	71	139	227	369
21	23	52	89	169	269
28	30	66	110	204
36	38	82	134
45	47	100
55	57
66

A180681 as an upper right triangle

1	3	6	10	15	21	28	36	45	55	66
	3	5	16	23	47	62	104	130	195	235
		6	8	22	44	74	115	196	268	395
			10	12	30	56	114	162	286	407
				15	17	40	71	139	227	369
					21	23	52	89	169	269
						28	30	66	110	204
							36	38	82	134
								45	47	100
									55	57
										66

										1
									3		3
								6		5		6
							10		16		8		10
						15		23		22		12		15
					21		47		44		30		17		21
				28		62		74		56		40		23		28
			36		104		115		114		71		52		30		36
		45		130		196		162		139		89		66		38		45
	55		195		268		286		227		169		110		82		47		55
66		235		395		407		369		269		204		134		100		57		66

1	3	6	10	15	21	28	36	45	55	66
3	5	16	23	47	62	104	130	195	235
6	8	22	44	74	115	196	268	395
10	12	30	56	114	162	286	407
15	17	40	71	139	227	369
21	23	52	89	169	269
28	30	66	110	204
36	38	82	134
45	47	100
55	57
66

1	3	6	10	15	21	28	36	45	55	66
	3	5	16	23	47	62	104	130	195	235
		6	8	22	44	74	115	196	268	395
			10	12	30	56	114	162	286	407
				15	17	40	71	139	227	369
					21	23	52	89	169	269
						28	30	66	110	204
							36	38	82	134
								45	47	100
									55	57
										66

										1
									3		3
								6		5		6
							10		16		8		10
						15		23		22		12		15
					21		47		44		30		17		21
				28		62		74		56		40		23		28
			36		104		115		114		71		52		30		36
		45		130		196		162		139		89		66		38		45
	55		195		268		286		227		169		110		82		47		55
66		235		395		407		369		269		204		134		100		57		66

1	3	6	10	15	21	28	36	45	55	66
3	5	16	23	47	62	104	130	195	235
6	8	22	44	74	115	196	268	395
10	12	30	56	114	162	286	407
15	17	40	71	139	227	369
21	23	52	89	169	269
28	30	66	110	204
36	38	82	134
45	47	100
55	57
66

1	3	6	10	15	21	28	36	45	55	66
	3	5	16	23	47	62	104	130	195	235
		6	8	22	44	74	115	196	268	395
			10	12	30	56	114	162	286	407
				15	17	40	71	139	227	369
					21	23	52	89	169	269
						28	30	66	110	204
							36	38	82	134
								45	47	100
									55	57
										66

										1
									3		3
								6		5		6
							10		16		8		10
						15		23		22		12		15
					21		47		44		30		17		21
				28		62		74		56		40		23		28
			36		104		115		114		71		52		30		36
		45		130		196		162		139		89		66		38		45
	55		195		268		286		227		169		110		82		47		55
66		235		395		407		369		269		204		134		100		57		66

1	3	6	10	15	21	28	36	45	55	66
3	5	16	23	47	62	104	130	195	235
6	8	22	44	74	115	196	268	395
10	12	30	56	114	162	286	407
15	17	40	71	139	227	369
21	23	52	89	169	269
28	30	66	110	204
36	38	82	134
45	47	100
55	57
66

1	3	6	10	15	21	28	36	45	55	66
	3	5	16	23	47	62	104	130	195	235
		6	8	22	44	74	115	196	268	395
			10	12	30	56	114	162	286	407
				15	17	40	71	139	227	369
					21	23	52	89	169	269
						28	30	66	110	204
							36	38	82	134
								45	47	100
									55	57
										66