A053556 as tables, graphs or sounds

A053556 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`2`
`3`		`3`
`4`		`8`
`5`		`30`
`6`		`144`
`7`		`280`
`8`		`5760`
`9`		`45360`
`10`		`44800`
`11`		`3991680`
`12`		`43545600`
`13`		`172972800`
`14`		`6706022400`
`15`		`93405312000`
`16`		`42268262400`
`17`		`22230464256000`
`18`		`376610217984000`
`19`		`250298560512000`
`20`		`11640679464960000`
`21`		`196503623737344000`
`22`		`17841281393295360000`

[1,1,2,3,8,30,144,280,5760,45360,44800,3991680, 43545600,172972800,6706022400,93405312000, 42268262400,22230464256000,376610217984000, 250298560512000,11640679464960000, 196503623737344000,17841281393295360000]

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

AT&T Labs Research