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 13 10:14 EDT 2024. Contains 375904 sequences. (Running on oeis4.)