A027221 - OEIS

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A027221 as a simple table

`n`		`a(n)`
`0`		`1`
`1`		`2`
`2`		`6`
`3`		`20`
`4`		`79`
`5`		`284`
`6`		`1237`
`7`		`4542`
`8`		`20626`
`9`		`76406`
`10`		`354080`
`11`		`1317964`
`12`		`6173634`
`13`		`23051344`
`14`		`108628550`
`15`		`406513364`
`16`		`1922354351`
`17`		`7206349304`
`18`		`34147706833`
`19`		`128187589014`
`20`		`608151037123`
`21`		`2285559568866`
`22`		`10850577045131`
`23`		`40817923301712`
`24`		`193850277807569`
`25`		`729825857819924`
`26`		`3466587141136257`

[1,2,6,20,79,284,1237,4542,20626,76406,354080, 1317964,6173634,23051344,108628550,406513364, 1922354351,7206349304,34147706833,128187589014, 608151037123,2285559568866,10850577045131, 40817923301712,193850277807569,729825857819924, 3466587141136257]

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Last modified September 17 03:10 EDT 2024. Contains 375984 sequences. (Running on oeis4.)