A027216 - OEIS

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A027216 as a simple table

`n`		`a(n)`
`1`		`1`
`2`		`4`
`3`		`15`
`4`		`63`
`5`		`237`
`6`		`1034`
`7`		`3945`
`8`		`17577`
`9`		`67640`
`10`		`304902`
`11`		`1179415`
`12`		`5352038`
`13`		`20771331`
`14`		`94628132`
`15`		`368083879`
`16`		`1680820301`
`17`		`6548692260`
`18`		`29946087674`
`19`		`116816782997`
`20`		`534628747310`

[1,4,15,63,237,1034,3945,17577,67640,304902, 1179415,5352038,20771331,94628132,368083879, 1680820301,6548692260,29946087674,116816782997, 534628747310]

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Last modified June 18 23:41 EDT 2013. Contains 226356 sequences.