A111561 as tables, graphs or sounds

A111561 formatted as a simple table:

`n`		`a(n)`
`0`		`0`
`1`		`2`
`2`		`7`
`3`		`44`
`4`		`354`
`5`		`3328`
`6`		`35144`
`7`		`407984`
`8`		`5137824`
`9`		`69566144`
`10`		`1006372864`
`11`		`15481560064`
`12`		`252326173824`
`13`		`4344015683584`
`14`		`78793242566144`
`15`		`1502374856981504`
`16`		`30052439647908864`
`17`		`629485600310349824`
`18`		`13783057303819485184`

[0,2,7,44,354,3328,35144,407984,5137824,69566144, 1006372864,15481560064,252326173824,4344015683584, 78793242566144,1502374856981504,30052439647908864, 629485600310349824,13783057303819485184]

Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research