A020728 - OEIS

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A020728 as a simple table

`n`		`a(n)`
`0`		`2`
`1`		`9`
`2`		`40`
`3`		`177`
`4`		`783`
`5`		`3463`
`6`		`15315`
`7`		`67730`
`8`		`299533`
`9`		`1324671`
`10`		`5858296`
`11`		`25908042`
`12`		`114577112`
`13`		`506711954`
`14`		`2240910072`
`15`		`9910320668`
`16`		`43827932664`
`17`		`193826995709`
`18`		`857190882207`
`19`		`3790886846546`
`20`		`16765020932461`
`21`		`74142526074589`
`22`		`327891876477017`
`23`		`1450086587978657`

[2,9,40,177,783,3463,15315,67730,299533,1324671, 5858296,25908042,114577112,506711954,2240910072, 9910320668,43827932664,193826995709,857190882207, 3790886846546,16765020932461,74142526074589, 327891876477017,1450086587978657]

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Last modified June 6 22:00 EDT 2024. Contains 373134 sequences. (Running on oeis4.)