A055883 - OEIS

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A055883 as a triangular array

1

1 1

2 4 2

5 15 15 5

15 60 90 60 15

52 260 520 520 260 52

203 1218 3045 4060 3045 1218 203

877 6139 18417 30695 30695 18417 6139 877

4140 33120 115920 231840 289800 231840 115920 33120 4140

21147

A055883 as a square array

`1`	`1`	`2`	`5`	`15`	`52`	`203`	`877`	`4140`	`21147`
`1`	`4`	`15`	`60`	`260`	`1218`	`6139`	`33120`
`2`	`15`	`90`	`520`	`3045`	`18417`	`115920`
`5`	`60`	`520`	`4060`	`30695`	`231840`
`15`	`260`	`3045`	`30695`	`289800`
`52`	`1218`	`18417`	`231840`
`203`	`6139`	`115920`
`877`	`33120`
`4140`

A055883 as an upper right triangle

`1`	`1`	`2`	`5`	`15`	`52`	`203`	`877`	`4140`	`21147`
	`1`	`4`	`15`	`60`	`260`	`1218`	`6139`	`33120`
		`2`	`15`	`90`	`520`	`3045`	`18417`	`115920`
			`5`	`60`	`520`	`4060`	`30695`	`231840`
				`15`	`260`	`3045`	`30695`	`289800`
					`52`	`1218`	`18417`	`231840`
						`203`	`6139`	`115920`
							`877`	`33120`
								`4140`

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Last modified September 3 04:27 EDT 2024. Contains 375649 sequences. (Running on oeis4.)