A121767 as tables, graphs or sounds

A121767 formatted as a simple table:

`n`		`a(n)`
`1`		`0`
`2`		`1`
`3`		`4`
`4`		`26`
`5`		`148`
`6`		`908`
`7`		`5600`
`8`		`35358`
`9`		`225900`
`10`		`1460495`
`11`		`9528580`
`12`		`62659826`
`13`		`414794388`
`14`		`2761665143`
`15`		`18478780624`
`16`		`124186579380`
`17`		`837825377160`
`18`		`5671852529106`
`19`		`38515222492016`
`20`		`262266364986772`
`21`		`1790362225181496`

[0,1,4,26,148,908,5600,35358,225900,1460495, 9528580,62659826,414794388,2761665143,18478780624, 124186579380,837825377160,5671852529106, 38515222492016,262266364986772,1790362225181496]

Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

AT&T Labs Research