A053508 as tables, graphs or sounds

A053508 formatted as a simple table:

`n`		`a(n)`
`1`		`0`
`2`		`0`
`3`		`0`
`4`		`1`
`5`		`20`
`6`		`360`
`7`		`6860`
`8`		`143360`
`9`		`3306744`
`10`		`84000000`
`11`		`2338460520`
`12`		`70946979840`
`13`		`2332989862060`
`14`		`82726831323136`
`15`		`3148511132812500`
`16`		`128071114403348480`
`17`		`5546563698427324720`
`18`		`254873089955815096320`
`19`		`12387799656377835411984`

[0,0,0,1,20,360,6860,143360,3306744,84000000, 2338460520,70946979840,2332989862060, 82726831323136,3148511132812500, 128071114403348480,5546563698427324720, 254873089955815096320,12387799656377835411984]

Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research