A010972 as tables, graphs or sounds

A010972 formatted as a simple table:

`n`		`a(n)`
`19`		`1`
`20`		`20`
`21`		`210`
`22`		`1540`
`23`		`8855`
`24`		`42504`
`25`		`177100`
`26`		`657800`
`27`		`2220075`
`28`		`6906900`
`29`		`20030010`
`30`		`54627300`
`31`		`141120525`
`32`		`347373600`
`33`		`818809200`
`34`		`1855967520`
`35`		`4059928950`
`36`		`8597496600`
`37`		`17672631900`
`38`		`35345263800`
`39`		`68923264410`

[1,20,210,1540,8855,42504,177100,657800,2220075, 6906900,20030010,54627300,141120525,347373600, 818809200,1855967520,4059928950,8597496600, 17672631900,35345263800,68923264410]

Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

AT&T Labs Research