A001540 as tables, graphs or sounds

A001540 formatted as a simple table:

`n`		`a(n)`
`1`		`0`
`2`		`2`
`3`		`8`
`4`		`36`
`5`		`184`
`6`		`1110`
`7`		`7776`
`8`		`62216`
`9`		`559952`
`10`		`5599530`
`11`		`61594840`
`12`		`739138092`
`13`		`9608795208`
`14`		`134523132926`
`15`		`2017846993904`
`16`		`32285551902480`
`17`		`548854382342176`
`18`		`9879378882159186`
`19`		`187708198761024552`
`20`		`3754163975220491060`

[0,2,8,36,184,1110,7776,62216,559952,5599530, 61594840,739138092,9608795208,134523132926, 2017846993904,32285551902480,548854382342176, 9879378882159186,187708198761024552, 3754163975220491060]

Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

AT&T Labs Research