A046090 as tables, graphs or sounds

A046090 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`4`
`2`		`21`
`3`		`120`
`4`		`697`
`5`		`4060`
`6`		`23661`
`7`		`137904`
`8`		`803761`
`9`		`4684660`
`10`		`27304197`
`11`		`159140520`
`12`		`927538921`
`13`		`5406093004`
`14`		`31509019101`
`15`		`183648021600`
`16`		`1070379110497`
`17`		`6238626641380`
`18`		`36361380737781`
`19`		`211929657785304`
`20`		`1235216565974041`

[1,4,21,120,697,4060,23661,137904,803761,4684660, 27304197,159140520,927538921,5406093004, 31509019101,183648021600,1070379110497, 6238626641380,36361380737781,211929657785304, 1235216565974041]

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

AT&T Labs Research