A006228 as tables, graphs or sounds

A006228 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`1`
`3`		`2`
`4`		`5`
`5`		`20`
`6`		`85`
`7`		`520`
`8`		`3145`
`9`		`26000`
`10`		`204425`
`11`		`2132000`
`12`		`20646925`
`13`		`260104000`
`14`		`2993804125`
`15`		`44217680000`
`16`		`589779412625`
`17`		`9993195680000`
`18`		`151573309044625`
`19`		`2898026747200000`
`20`		`49261325439503125`
`21`		`1049085682486400000`

[1,1,1,2,5,20,85,520,3145,26000,204425,2132000, 20646925,260104000,2993804125,44217680000, 589779412625,9993195680000,151573309044625, 2898026747200000,49261325439503125, 1049085682486400000]

Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

AT&T Labs Research