A030980 as tables, graphs or sounds

A030980 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`0`
`3`		`3`
`4`		`4`
`5`		`23`
`6`		`66`
`7`		`280`
`8`		`1030`
`9`		`4207`
`10`		`16852`
`11`		`69747`
`12`		`289950`
`13`		`1222540`
`14`		`5192344`
`15`		`22239672`
`16`		`95864902`
`17`		`415730735`
`18`		`1812177000`
`19`		`7936353049`
`20`		`34901789568`
`21`		`154067755503`
`22`		`682428824890`
`23`		`3032173906692`
`24`		`13510960371744`

[1,0,3,4,23,66,280,1030,4207,16852,69747,289950, 1222540,5192344,22239672,95864902,415730735, 1812177000,7936353049,34901789568,154067755503, 682428824890,3032173906692,13510960371744]

Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

AT&T Labs Research