A020881 - OEIS

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A020881 as a simple table

`n`		`a(n)`
`2`		`18`
`3`		`102`
`4`		`418`
`5`		`2006`
`6`		`8946`
`7`		`41222`
`8`		`187202`
`9`		`855606`
`10`		`3899538`
`11`		`17794662`
`12`		`81157858`
`13`		`370232726`
`14`		`1688782386`
`15`		`7703577542`
`16`		`35140060802`
`17`		`160293673206`
`18`		`731187195858`

[18,102,418,2006,8946,41222,187202,855606,3899538, 17794662,81157858,370232726,1688782386,7703577542, 35140060802,160293673206,731187195858]

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Last modified April 18 18:58 EDT 2024. Contains 371781 sequences. (Running on oeis4.)