A188981 - OEIS

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A188981 as a triangular array

0

1 1

2 9 2

4 116 116 4

6 900 7264 900 6

13 7836 295264 295264 7836 13

24 71865 12838276 54113236 12838276 71865 24

45 640513 577290185 10523263424 10523263424 577290185 640513 45

84 5706113 25631148992

A188981 as a square array

`0`	`1`	`2`	`4`	`6`	`13`	`24`	`45`	`84`
`1`	`9`	`116`	`900`	`7836`	`71865`	`640513`	`5706113`
`2`	`116`	`7264`	`295264`	`12838276`	`577290185`	`25631148992`
`4`	`900`	`295264`	`54113236`	`10523263424`
`6`	`7836`	`12838276`	`10523263424`
`13`	`71865`	`577290185`
`24`	`640513`
`45`

A188981 as an upper right triangle

`0`	`1`	`2`	`4`	`6`	`13`	`24`	`45`	`84`
	`1`	`9`	`116`	`900`	`7836`	`71865`	`640513`	`5706113`
		`2`	`116`	`7264`	`295264`	`12838276`	`577290185`	`25631148992`
			`4`	`900`	`295264`	`54113236`	`10523263424`
				`6`	`7836`	`12838276`	`10523263424`
					`13`	`71865`	`577290185`
						`24`	`640513`
							`45`

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Last modified September 23 02:06 EDT 2023. Contains 365532 sequences. (Running on oeis4.)