A002421 - OEIS

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A002421 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`-6`
`2`		`6`
`3`		`4`
`4`		`6`
`5`		`12`
`6`		`28`
`7`		`72`
`8`		`198`
`9`		`572`
`10`		`1716`
`11`		`5304`
`12`		`16796`
`13`		`54264`
`14`		`178296`
`15`		`594320`
`16`		`2005830`
`17`		`6843420`
`18`		`23571780`
`19`		`81880920`
`20`		`286583220`
`21`		`1009864680`
`22`		`3580429320`
`23`		`12765008880`
`24`		`45741281820`
`25`		`164668614552`
`26`		`595340375688`
`27`		`2160865067312`
`28`		`7871722745208`
`29`		`28772503827312`

[1,-6,6,4,6,12,28,72,198,572,1716,5304,16796, 54264,178296,594320,2005830,6843420,23571780, 81880920,286583220,1009864680,3580429320, 12765008880,45741281820,164668614552,595340375688, 2160865067312,7871722745208,28772503827312]

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Last modified April 25 05:18 EDT 2024. Contains 371964 sequences. (Running on oeis4.)