A081621 as tables, graphs or sounds

A081621 formatted as a simple table:

`n`		`a(n)`
`4`		`0`
`5`		`0`
`6`		`0`
`7`		`0`
`8`		`0`
`9`		`0`
`10`		`0`
`11`		`0`
`12`		`1`
`13`		`0`
`14`		`1`
`15`		`1`
`16`		`3`
`17`		`4`
`18`		`12`
`19`		`23`
`20`		`73`
`21`		`192`
`22`		`651`
`23`		`2070`
`24`		`7290`
`25`		`25381`
`26`		`91441`
`27`		`329824`
`28`		`1204737`
`29`		`4412031`
`30`		`16248772`
`31`		`59995535`
`32`		`222231424`
`33`		`825028656`
`34`		`3069993552`
`35`		`11446245342`
`36`		`42758608761`
`37`		`160012226334`
`38`		`599822851579`
`39`		`2252137171764`
`40`		`8469193859271`

[0,0,0,0,0,0,0,0,1,0,1,1,3,4,12,23,73,192,651, 2070,7290,25381,91441,329824,1204737,4412031, 16248772,59995535,222231424,825028656,3069993552, 11446245342,42758608761,160012226334,599822851579, 2252137171764,8469193859271]

Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

AT&T Labs Research