A110561 as tables, graphs or sounds

A110561 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`1`
`3`		`3`
`4`		`8`
`5`		`40`
`6`		`180`
`7`		`140`
`8`		`896`
`9`		`72576`
`10`		`604800`
`11`		`6652800`
`12`		`68428800`
`13`		`59304960`
`14`		`726485760`
`15`		`163459296000`
`16`		`2324754432000`
`17`		`39520825344000`
`18`		`640237370572800`
`19`		`579262382899200`
`20`		`10532043325440000`
`21`		`4644631106519040000`

[1,1,1,3,8,40,180,140,896,72576,604800,6652800, 68428800,59304960,726485760,163459296000, 2324754432000,39520825344000,640237370572800, 579262382899200,10532043325440000, 4644631106519040000]

Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research