A002493 as tables, graphs or sounds

A002493 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`0`
`3`		`0`
`4`		`0`
`5`		`10`
`6`		`60`
`7`		`462`
`8`		`3920`
`9`		`36954`
`10`		`382740`
`11`		`4327510`
`12`		`53088888`
`13`		`702756210`
`14`		`9988248956`
`15`		`151751644590`
`16`		`2454798429600`
`17`		`42130249479562`
`18`		`764681923900260`
`19`		`14636063499474054`
`20`		`294639009867223880`

[1,0,0,0,10,60,462,3920,36954,382740,4327510, 53088888,702756210,9988248956,151751644590, 2454798429600,42130249479562,764681923900260, 14636063499474054,294639009867223880]

Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

AT&T Labs Research