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A089979 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`4`
`2`		`16`
`3`		`68`
`4`		`288`
`5`		`1216`
`6`		`5136`
`7`		`21696`
`8`		`91648`
`9`		`387136`
`10`		`1635328`
`11`		`6907904`
`12`		`29180160`
`13`		`123261952`
`14`		`520679424`
`15`		`2199438336`
`16`		`9290801152`
`17`		`39245922304`
`18`		`165781442560`
`19`		`700288974848`
`20`		`2958139588608`
`21`		`12495684124672`
`22`		`52783892398080`

[1,4,16,68,288,1216,5136,21696,91648,387136, 1635328,6907904,29180160,123261952,520679424, 2199438336,9290801152,39245922304,165781442560, 700288974848,2958139588608,12495684124672, 52783892398080]

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Last modified August 6 06:14 EDT 2024. Contains 374960 sequences. (Running on oeis4.)