A020018 - OEIS

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A020018 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`0`
`2`		`0`
`3`		`0`
`4`		`1`
`5`		`3`
`6`		`15`
`7`		`91`
`8`		`649`
`9`		`5253`
`10`		`47802`
`11`		`482796`
`12`		`5359036`
`13`		`64844333`
`14`		`849460756`
`15`		`11977396665`
`16`		`180858689642`
`17`		`2911824903230`
`18`		`49792205845229`
`19`		`901238925798638`
`20`		`17213663482753993`
`21`		`345994636003355265`
`22`		`7300486819670796088`

[1,0,0,0,1,3,15,91,649,5253,47802,482796,5359036, 64844333,849460756,11977396665,180858689642, 2911824903230,49792205845229,901238925798638, 17213663482753993,345994636003355265, 7300486819670796088]

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Last modified April 25 10:51 EDT 2024. Contains 371967 sequences. (Running on oeis4.)