A020071 as tables, graphs or sounds

A020071 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`0`
`2`		`1`
`3`		`2`
`4`		`9`
`5`		`44`
`6`		`251`
`7`		`1665`
`8`		`12700`
`9`		`109544`
`10`		`1054363`
`11`		`11202616`
`12`		`130230419`
`13`		`1644159040`
`14`		`22401666926`
`15`		`327624378797`
`16`		`5119130918712`
`17`		`85105551523594`
`18`		`1499985345603353`
`19`		`27937227061862467`
`20`		`548268081089050917`

[1,0,1,2,9,44,251,1665,12700,109544,1054363, 11202616,130230419,1644159040,22401666926, 327624378797,5119130918712,85105551523594, 1499985345603353,27937227061862467, 548268081089050917]

Last modified December 4 08:07 EST 2009. Contains 170310 sequences.

AT&T Labs Research