A072221 as tables, graphs or sounds

A072221 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`4`
`2`		`25`
`3`		`148`
`4`		`865`
`5`		`5044`
`6`		`29401`
`7`		`171364`
`8`		`998785`
`9`		`5821348`
`10`		`33929305`
`11`		`197754484`
`12`		`1152597601`
`13`		`6717831124`
`14`		`39154389145`
`15`		`228208503748`
`16`		`1330096633345`
`17`		`7752371296324`
`18`		`45184131144601`
`19`		`263352415571284`
`20`		`1534930362283105`

[1,4,25,148,865,5044,29401,171364,998785,5821348, 33929305,197754484,1152597601,6717831124, 39154389145,228208503748,1330096633345, 7752371296324,45184131144601,263352415571284, 1534930362283105]

Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

AT&T Labs Research