A049681 as tables, graphs or sounds

A049681 formatted as a simple table:

`n`		`a(n)`
`0`		`0`
`1`		`1`
`2`		`2`
`3`		`7`
`4`		`20`
`5`		`56`
`6`		`152`
`7`		`407`
`8`		`1080`
`9`		`2851`
`10`		`7502`
`11`		`19702`
`12`		`51680`
`13`		`135461`
`14`		`354902`
`15`		`929567`
`16`		`2434320`
`17`		`6374236`
`18`		`16689752`
`19`		`43697227`
`20`		`114405500`
`21`		`299525051`
`22`		`784179002`
`23`		`2053027082`
`24`		`5374926720`
`25`		`14071792681`

[0,1,2,7,20,56,152,407,1080,2851,7502,19702,51680, 135461,354902,929567,2434320,6374236,16689752, 43697227,114405500,299525051,784179002,2053027082, 5374926720,14071792681]

Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

AT&T Labs Research