A121547 as tables, graphs or sounds

A121547 formatted as a simple table:

`n`		`a(n)`
`0`		`0`
`1`		`0`
`2`		`1`
`3`		`0`
`4`		`4`
`5`		`4`
`6`		`0`
`7`		`10`
`8`		`20`
`9`		`10`
`10`		`0`
`11`		`20`
`12`		`60`
`13`		`60`
`14`		`20`
`15`		`0`
`16`		`35`
`17`		`140`
`18`		`210`
`19`		`140`
`20`		`35`
`21`		`0`
`22`		`56`
`23`		`280`
`24`		`560`
`25`		`560`
`26`		`280`
`27`		`56`
`28`		`0`
`29`		`84`
`30`		`504`
`31`		`1260`
`32`		`1680`
`33`		`1260`
`34`		`504`
`35`		`84`
`36`		`0`
`37`		`120`
`38`		`840`
`39`		`2520`
`40`		`4200`
`41`		`4200`
`42`		`2520`
`43`		`840`
`44`		`120`
`45`		`0`
`46`		`165`
`47`		`1320`
`48`		`4620`
`49`		`9240`
`50`		`11550`
`51`		`9240`
`52`		`4620`
`53`		`1320`
`54`		`165`
`55`		`1980`
`56`		`7920`

[0,0,1,0,4,4,0,10,20,10,0,20,60,60,20,0,35,140, 210,140,35,0,56,280,560,560,280,56,0,84,504,1260, 1680,1260,504,84,0,120,840,2520,4200,4200,2520, 840,120,0,165,1320,4620,9240,11550,9240,4620,1320, 165,1980,7920]

Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research