A009806 - OEIS

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A009806 as a simple table

`n`		`a(n)`
`0`		`0`
`1`		`1`
`2`		`-1`
`3`		`2`
`4`		`-6`
`5`		`16`
`6`		`0`
`7`		`-792`
`8`		`13776`
`9`		`-200552`
`10`		`2855880`
`11`		`-41436352`
`12`		`620388912`
`13`		`-9606956592`
`14`		`153409074000`
`15`		`-2508503487232`
`16`		`41503122145920`
`17`		`-680444083117184`
`18`		`10600133081473152`
`19`		`-140189781816392448`
`20`		`819083424632851200`

[0,1,-1,2,-6,16,0,-792,13776,-200552,2855880, -41436352,620388912,-9606956592,153409074000, -2508503487232,41503122145920,-680444083117184, 10600133081473152,-140189781816392448, 819083424632851200]

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Last modified April 23 11:07 EDT 2024. Contains 371905 sequences. (Running on oeis4.)