A291856 - OEIS

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A291856 as a simple table

`n`		`a(n)`
`0`		`-1`
`1`		`1`
`2`		`0`
`3`		`2`
`4`		`2`
`5`		`10`
`6`		`20`
`7`		`80`
`8`		`220`
`9`		`860`
`10`		`2840`
`11`		`11440`
`12`		`42680`
`13`		`179960`
`14`		`734800`
`15`		`3254240`
`16`		`14276240`
`17`		`66344080`
`18`		`309040160`
`19`		`1503233600`
`20`		`7374996640`
`21`		`37439668640`
`22`		`192314598080`
`23`		`1015987308160`
`24`		`5439223064000`
`25`		`29822918459840`
`26`		`165803495059840`
`27`		`941199375015680`

[-1,1,0,2,2,10,20,80,220,860,2840,11440,42680, 179960,734800,3254240,14276240,66344080,309040160, 1503233600,7374996640,37439668640,192314598080, 1015987308160,5439223064000,29822918459840, 165803495059840,941199375015680]

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Last modified April 30 06:27 EDT 2024. Contains 372127 sequences. (Running on oeis4.)