A020091 as tables, graphs or sounds

A020091 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`2`
`3`		`6`
`4`		`21`
`5`		`99`
`6`		`584`
`7`		`4039`
`8`		`31971`
`9`		`285070`
`10`		`2826942`
`11`		`30860774`
`12`		`367757554`
`13`		`4750201728`
`14`		`66106974038`
`15`		`986095696056`
`16`		`15695356495548`
`17`		`265513114049684`
`18`		`4757109960056837`
`19`		`89988663411075165`
`20`		`1792274212937247028`

[1,1,2,6,21,99,584,4039,31971,285070,2826942, 30860774,367757554,4750201728,66106974038, 986095696056,15695356495548,265513114049684, 4757109960056837,89988663411075165, 1792274212937247028]

Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

AT&T Labs Research