A013989 as tables, graphs or sounds

A013989 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`2`
`2`		`6`
`3`		`16`
`4`		`50`
`5`		`156`
`6`		`532`
`7`		`1856`
`8`		`6876`
`9`		`26200`
`10`		`104456`
`11`		`428352`
`12`		`1821976`
`13`		`7959056`
`14`		`35857200`
`15`		`165592576`
`16`		`785514512`
`17`		`3812387616`
`18`		`18948962656`
`19`		`96194028800`
`20`		`498931946016`
`21`		`2638959243712`
`22`		`14234346694976`

[1,2,6,16,50,156,532,1856,6876,26200,104456, 428352,1821976,7959056,35857200,165592576, 785514512,3812387616,18948962656,96194028800, 498931946016,2638959243712,14234346694976]

Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

AT&T Labs Research