A047891 as tables, graphs or sounds

A047891 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`3`
`3`		`12`
`4`		`57`
`5`		`300`
`6`		`1686`
`7`		`9912`
`8`		`60213`
`9`		`374988`
`10`		`2381322`
`11`		`15361896`
`12`		`100389306`
`13`		`663180024`
`14`		`4421490924`
`15`		`29712558576`
`16`		`201046204173`
`17`		`1368578002188`
`18`		`9366084668802`
`19`		`64403308499592`
`20`		`444739795023054`
`21`		`3082969991029800`

[1,3,12,57,300,1686,9912,60213,374988,2381322, 15361896,100389306,663180024,4421490924, 29712558576,201046204173,1368578002188, 9366084668802,64403308499592,444739795023054, 3082969991029800]

Last modified December 16 13:01 EST 2009. Contains 170825 sequences.

AT&T Labs Research