A115117 as tables, graphs or sounds

A115117 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`2`
`3`		`7`
`4`		`20`
`5`		`68`
`6`		`224`
`7`		`780`
`8`		`2720`
`9`		`9709`
`10`		`34918`
`11`		`127100`
`12`		`465920`
`13`		`1720740`
`14`		`6390930`
`15`		`23860928`
`16`		`89477120`
`17`		`336860180`
`18`		`1272578048`
`19`		`4822419420`
`20`		`18325176316`
`21`		`69810262080`
`22`		`266548209850`
`23`		`1019836872140`
`24`		`3909374443520`
`25`		`15011998757888`

[1,2,7,20,68,224,780,2720,9709,34918,127100, 465920,1720740,6390930,23860928,89477120, 336860180,1272578048,4822419420,18325176316, 69810262080,266548209850,1019836872140, 3909374443520,15011998757888]

Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

AT&T Labs Research