A215904 - OEIS

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A215904 as a triangular array

1

1 1

2 1 2

2 2 2 2

5 5 15 5 5

5 15 42 42 15 5

15 52 726 602 726 52 15

15 203 2906 12840 12840 2906 203 15

52 877 84550 373780 2387217 373780 84550 877 52

52 4140 433252 14050312 87852626 87852626 14050312 433252

A215904 as a square array

`1`	`1`	`2`	`2`	`5`	`5`	`15`	`15`	`52`	`52`
`1`	`1`	`2`	`5`	`15`	`52`	`203`	`877`	`4140`
`2`	`2`	`15`	`42`	`726`	`2906`	`84550`	`433252`
`2`	`5`	`42`	`602`	`12840`	`373780`	`14050312`
`5`	`15`	`726`	`12840`	`2387217`	`87852626`
`5`	`52`	`2906`	`373780`	`87852626`
`15`	`203`	`84550`	`14050312`
`15`	`877`	`433252`
`52`

A215904 as an upper right triangle

`1`	`1`	`2`	`2`	`5`	`5`	`15`	`15`	`52`	`52`
	`1`	`1`	`2`	`5`	`15`	`52`	`203`	`877`	`4140`
		`2`	`2`	`15`	`42`	`726`	`2906`	`84550`	`433252`
			`2`	`5`	`42`	`602`	`12840`	`373780`	`14050312`
				`5`	`15`	`726`	`12840`	`2387217`	`87852626`
					`5`	`52`	`2906`	`373780`	`87852626`
						`15`	`203`	`84550`	`14050312`
							`15`	`877`	`433252`
								`52`

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Last modified April 23 03:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)