A015532 as tables, graphs or sounds

A015532 formatted as a simple table:

`n`		`a(n)`
`0`		`0`
`1`		`1`
`2`		`4`
`3`		`23`
`4`		`120`
`5`		`641`
`6`		`3404`
`7`		`18103`
`8`		`96240`
`9`		`511681`
`10`		`2720404`
`11`		`14463383`
`12`		`76896360`
`13`		`408829121`
`14`		`2173591004`
`15`		`11556167863`
`16`		`61439808480`
`17`		`326652408961`
`18`		`1736688295204`
`19`		`9233320043543`
`20`		`49090098240600`
`21`		`260993633267201`

[0,1,4,23,120,641,3404,18103,96240,511681,2720404, 14463383,76896360,408829121,2173591004, 11556167863,61439808480,326652408961, 1736688295204,9233320043543,49090098240600, 260993633267201]

Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research