A004664 - OEIS

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A004664 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`2`
`2`		`6`
`3`		`15`
`4`		`40`
`5`		`145`
`6`		`756`
`7`		`5089`
`8`		`40384`
`9`		`362961`
`10`		`3628900`
`11`		`39916921`
`12`		`479001744`
`13`		`6227020969`
`14`		`87178291396`
`15`		`1307674368225`
`16`		`20922789888256`
`17`		`355687428096289`
`18`		`6402373705728324`
`19`		`121645100408832361`
`20`		`2432902008176640400`
`21`		`51090942171709440441`
`22`		`1124000727777607680484`

[1,2,6,15,40,145,756,5089,40384,362961,3628900, 39916921,479001744,6227020969,87178291396, 1307674368225,20922789888256,355687428096289, 6402373705728324,121645100408832361, 2432902008176640400,51090942171709440441, 1124000727777607680484]

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Last modified April 20 10:14 EDT 2024. Contains 371813 sequences. (Running on oeis4.)