A215847 - OEIS

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A215847 as a triangular array

											1
										1		1
									1		1		1
								1		1		1		1
							2		2		4		2		2
						2		5		8		8		5		2
					5		15		102		78		102		15		5
				5		52		364		1250		1250		364		52		5
			15		203		8460		29084		159712		29084		8460		203		15
		15		877		40612		908408		4851360		4851360		908408		40612		877		15
	52		4140		1440676

A215847 as a square array

1	1	1	1	2	2	5	5	15	15	52
1	1	1	2	5	15	52	203	877	4140
1	1	4	8	102	364	8460	40612	1440676
1	2	8	78	1250	29084	908408
2	5	102	1250	159712	4851360
2	15	364	29084	4851360
5	52	8460	908408
5	203	40612
15	877
15

A215847 as an upper right triangle

1	1	1	1	2	2	5	5	15	15	52
	1	1	1	2	5	15	52	203	877	4140
		1	1	4	8	102	364	8460	40612	1440676
			1	2	8	78	1250	29084	908408
				2	5	102	1250	159712	4851360
					2	15	364	29084	4851360
						5	52	8460	908408
							5	203	40612
								15	877
									15

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Last modified September 21 19:19 EDT 2024. Contains 376089 sequences. (Running on oeis4.)