A026639 - OEIS

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A026639 as a simple table

`n`		`a(n)`
`1`		`1`
`2`		`5`
`3`		`20`
`4`		`74`
`5`		`278`
`6`		`1049`
`7`		`3980`
`8`		`15170`
`9`		`58052`
`10`		`222914`
`11`		`858512`
`12`		`3314960`
`13`		`12829070`
`14`		`49748705`
`15`		`193259660`
`16`		`751954250`
`17`		`2929965020`
`18`		`11431262390`
`19`		`44651369720`
`20`		`174597927740`
`21`		`683388447260`
`22`		`2677230376490`
`23`		`10496941482680`
`24`		`41188078562324`

[1,5,20,74,278,1049,3980,15170,58052,222914, 858512,3314960,12829070,49748705,193259660, 751954250,2929965020,11431262390,44651369720, 174597927740,683388447260,2677230376490, 10496941482680,41188078562324]

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Last modified June 28 04:00 EDT 2022. Contains 354903 sequences. (Running on oeis4.)