A231641 - OEIS

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A231641 as a triangular array

									1
								1		1
							3		5		3
						8		25		25		8
					21		124		362		124		21
				55		599		5110		5110		599		55
			144		2907		69671		193596		69671		2907		144
		377		14098		953726		7176194		7176194		953726		14098		377
	987		68345		13036446		266730604		722149510		266730604

A231641 as a square array

1	1	3	8	21	55	144	377	987
1	5	25	124	599	2907	14098	68345
3	25	362	5110	69671	953726	13036446
8	124	5110	193596	7176194	266730604
21	599	69671	7176194	722149510
55	2907	953726	266730604
144	14098
377

A231641 as an upper right triangle

1	1	3	8	21	55	144	377	987
	1	5	25	124	599	2907	14098	68345
		3	25	362	5110	69671	953726	13036446
			8	124	5110	193596	7176194	266730604
				21	599	69671	7176194	722149510
					55	2907	953726	266730604
						144	14098
							377