A020040 as tables, graphs or sounds

A020040 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`0`
`2`		`0`
`3`		`1`
`4`		`2`
`5`		`7`
`6`		`37`
`7`		`229`
`8`		`1647`
`9`		`13507`
`10`		`124269`
`11`		`1267543`
`12`		`14196477`
`13`		`173197024`
`14`		`2286200718`
`15`		`32464050199`
`16`		`493453563029`
`17`		`7993947721071`
`18`		`137495900802424`
`19`		`2502425394604114`
`20`		`48046567576398986`
`21`		`970540665043259525`

[1,0,0,1,2,7,37,229,1647,13507,124269,1267543, 14196477,173197024,2286200718,32464050199, 493453563029,7993947721071,137495900802424, 2502425394604114,48046567576398986, 970540665043259525]

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

AT&T Labs Research