A002871 - OEIS

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A002871 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`2`
`2`		`4`
`3`		`12`
`4`		`48`
`5`		`200`
`6`		`1040`
`7`		`5600`
`8`		`33600`
`9`		`222432`
`10`		`1460928`
`11`		`11487168`
`12`		`84713728`
`13`		`731574272`
`14`		`6314147840`
`15`		`55456727040`
`16`		`548291597568`
`17`		`5226494727168`
`18`		`54361802626560`
`19`		`586042688924160`
`20`		`6149776714099200`
`21`		`72895623466265600`
`22`		`855187250563024896`

[1,2,4,12,48,200,1040,5600,33600,222432,1460928, 11487168,84713728,731574272,6314147840, 55456727040,548291597568,5226494727168, 54361802626560,586042688924160,6149776714099200, 72895623466265600,855187250563024896]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)