A046729 as tables, graphs or sounds

A046729 formatted as a simple table:

`n`		`a(n)`
`0`		`0`
`1`		`4`
`2`		`20`
`3`		`120`
`4`		`696`
`5`		`4060`
`6`		`23660`
`7`		`137904`
`8`		`803760`
`9`		`4684660`
`10`		`27304196`
`11`		`159140520`
`12`		`927538920`
`13`		`5406093004`
`14`		`31509019100`
`15`		`183648021600`
`16`		`1070379110496`
`17`		`6238626641380`
`18`		`36361380737780`
`19`		`211929657785304`
`20`		`1235216565974040`

[0,4,20,120,696,4060,23660,137904,803760,4684660, 27304196,159140520,927538920,5406093004, 31509019100,183648021600,1070379110496, 6238626641380,36361380737780,211929657785304, 1235216565974040]

Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

AT&T Labs Research