A003013 as tables, graphs or sounds

A003013 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`4`
`3`		`15`
`4`		`52`
`5`		`165`
`6`		`486`
`7`		`1351`
`8`		`3592`
`9`		`9225`
`10`		`23050`
`11`		`56331`
`12`		`135180`
`13`		`319501`
`14`		`745486`
`15`		`1720335`
`16`		`3932176`
`17`		`8912913`
`18`		`20054034`
`19`		`44826643`
`20`		`99614740`
`21`		`220200981`
`22`		`484442134`
`23`		`1061158935`
`24`		`2315255832`
`25`		`5033164825`

[1,1,4,15,52,165,486,1351,3592,9225,23050,56331, 135180,319501,745486,1720335,3932176,8912913, 20054034,44826643,99614740,220200981,484442134, 1061158935,2315255832,5033164825]

Last modified December 1 13:27 EST 2009. Contains 167806 sequences.

AT&T Labs Research