A195074 - OEIS

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A195074 as a triangular array

												1
											3		2
										6		4		5
									10		7		9		8
								15		11		14		12		13
							21		16		20		17		19		18
						28		22		27		23		26		25		24
					36		29		35		30		34		33		31		32
				45		37		44		38		43		42		39		41		40
			55		46		54		47		53		52		48		51		49		50
		66		56		65		57		64		63		58		62		59		61		60
	78		67		77

A195074 as a square array

1	3	6	10	15	21	28	36	45	55	66	78
2	4	7	11	16	22	29	37	46	56	67
5	9	14	20	27	35	44	54	65	77
8	12	17	23	30	38	47	57
13	19	26	34	43	53	64
18	25	33	42	52	63
24	31	39	48	58
32	41	51	62
40	49	59
50	61
60

A195074 as an upper right triangle

1	3	6	10	15	21	28	36	45	55	66	78
	2	4	7	11	16	22	29	37	46	56	67
		5	9	14	20	27	35	44	54	65	77
			8	12	17	23	30	38	47	57
				13	19	26	34	43	53	64
					18	25	33	42	52	63
						24	31	39	48	58
							32	41	51	62
								40	49	59
									50	61
										60