A055981 - OEIS

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A055981 as a simple table

`n`		`a(n)`
`1`		`1`
`2`		`1`
`3`		`2`
`4`		`3`
`5`		`8`
`6`		`24`
`7`		`84`
`8`		`420`
`9`		`2268`
`10`		`13440`
`11`		`73920`
`12`		`604800`
`13`		`3931200`
`14`		`33633600`
`15`		`324324000`
`16`		`3891888000`
`17`		`33081048000`
`18`		`435891456000`
`19`		`4140968832000`
`20`		`59281238016000`
`21`		`840311548876800`
`22`		`11708340914350080`
`23`		`134645920515025920`
`24`		`2554547108585472000`
`25`		`45616912653312000000`

[1,1,2,3,8,24,84,420,2268,13440,73920,604800, 3931200,33633600,324324000,3891888000,33081048000, 435891456000,4140968832000,59281238016000, 840311548876800,11708340914350080, 134645920515025920,2554547108585472000, 45616912653312000000]

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)