A221678 - OEIS

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A221678 as a simple table

`n`		`a(n)`
`1`		`0`
`2`		`2`
`3`		`5`
`4`		`20`
`5`		`68`
`6`		`241`
`7`		`844`
`8`		`2966`
`9`		`10413`
`10`		`36568`
`11`		`128408`
`12`		`450913`
`13`		`1583400`
`14`		`5560186`
`15`		`19524853`
`16`		`68562444`
`17`		`240760252`
`18`		`845440977`
`19`		`2968805844`
`20`		`10425101678`
`21`		`36608235997`
`22`		`128551546480`
`23`		`451414815600`
`24`		`1585164405441`
`25`		`5566379537040`

[0,2,5,20,68,241,844,2966,10413,36568,128408, 450913,1583400,5560186,19524853,68562444, 240760252,845440977,2968805844,10425101678, 36608235997,128551546480,451414815600, 1585164405441,5566379537040]

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Last modified September 7 09:52 EDT 2024. Contains 375730 sequences. (Running on oeis4.)