A137972 as tables, graphs or sounds

A137972 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`6`
`3`		`39`
`4`		`320`
`5`		`2787`
`6`		`25788`
`7`		`247731`
`8`		`2449188`
`9`		`24753960`
`10`		`254610962`
`11`		`2656496133`
`12`		`28046838948`
`13`		`299085697722`
`14`		`3216723340218`
`15`		`34852657892685`
`16`		`380063012970680`
`17`		`4168108473073596`
`18`		`45941874232280862`
`19`		`508664757809869052`

[1,1,6,39,320,2787,25788,247731,2449188,24753960, 254610962,2656496133,28046838948,299085697722, 3216723340218,34852657892685,380063012970680, 4168108473073596,45941874232280862, 508664757809869052]

Last modified December 6 13:15 EST 2009. Contains 170429 sequences.

AT&T Labs Research