A006974 - OEIS

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A006974 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`9`
`2`		`50`
`3`		`220`
`4`		`840`
`5`		`2912`
`6`		`9408`
`7`		`28800`
`8`		`84480`
`9`		`239360`
`10`		`658944`
`11`		`1770496`
`12`		`4659200`
`13`		`12042240`
`14`		`30638080`
`15`		`76873728`
`16`		`190513152`
`17`		`466944000`
`18`		`1133117440`
`19`		`2724986880`
`20`		`6499598336`
`21`		`15386804224`
`22`		`36175872000`
`23`		`84515225600`
`24`		`196293427200`
`25`		`453437816832`

[1,9,50,220,840,2912,9408,28800,84480,239360, 658944,1770496,4659200,12042240,30638080,76873728, 190513152,466944000,1133117440,2724986880, 6499598336,15386804224,36175872000,84515225600, 196293427200,453437816832]

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Last modified March 6 20:37 EST 2021. Contains 341850 sequences. (Running on oeis4.)