A001909 as tables, graphs or sounds

A001909 formatted as a simple table:

`n`		`a(n)`
`2`		`0`
`3`		`1`
`4`		`4`
`5`		`21`
`6`		`134`
`7`		`1001`
`8`		`8544`
`9`		`81901`
`10`		`870274`
`11`		`10146321`
`12`		`128718044`
`13`		`1764651461`
`14`		`25992300894`
`15`		`409295679481`
`16`		`6860638482424`
`17`		`121951698034461`
`18`		`2291179503374234`
`19`		`45361686034627361`
`20`		`943892592746534964`

[0,1,4,21,134,1001,8544,81901,870274,10146321, 128718044,1764651461,25992300894,409295679481, 6860638482424,121951698034461,2291179503374234, 45361686034627361,943892592746534964]

Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

AT&T Labs Research