A002720 as tables, graphs or sounds

A002720 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`2`
`2`		`7`
`3`		`34`
`4`		`209`
`5`		`1546`
`6`		`13327`
`7`		`130922`
`8`		`1441729`
`9`		`17572114`
`10`		`234662231`
`11`		`3405357682`
`12`		`53334454417`
`13`		`896324308634`
`14`		`16083557845279`
`15`		`306827170866106`
`16`		`6199668952527617`
`17`		`132240988644215842`
`18`		`2968971263911288999`

[1,2,7,34,209,1546,13327,130922,1441729,17572114, 234662231,3405357682,53334454417,896324308634, 16083557845279,306827170866106,6199668952527617, 132240988644215842,2968971263911288999]

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research