A053489 as tables, graphs or sounds

A053489 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`0`
`2`		`4`
`3`		`6`
`4`		`64`
`5`		`300`
`6`		`2568`
`7`		`20160`
`8`		`193856`
`9`		`1989792`
`10`		`22687200`
`11`		`279956160`
`12`		`3737966208`
`13`		`53589444480`
`14`		`821522026752`
`15`		`13407498599040`
`16`		`232106716968960`
`17`		`4248256958023680`
`18`		`81968803604600832`
`19`		`1662870215019018240`
`20`		`35384007384670648320`
`21`		`788053048823608565760`

[1,0,4,6,64,300,2568,20160,193856,1989792, 22687200,279956160,3737966208,53589444480, 821522026752,13407498599040,232106716968960, 4248256958023680,81968803604600832, 1662870215019018240,35384007384670648320, 788053048823608565760]

Last modified December 16 13:01 EST 2009. Contains 170825 sequences.

AT&T Labs Research