A144272 as tables, graphs or sounds

A144272 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`4`
`3`		`18`
`4`		`129`
`5`		`1095`
`6`		`11880`
`7`		`149940`
`8`		`2218545`
`9`		`37147005`
`10`		`699281100`
`11`		`14561835750`
`12`		`332913128625`
`13`		`8280095098275`
`14`		`222659485448400`
`15`		`6434896997529000`
`16`		`198909798356894625`
`17`		`6547761582390653625`
`18`		`228681849947367316500`
`19`		`8445341134525197152250`
`20`		`328822530412023653630625`

[1,1,4,18,129,1095,11880,149940,2218545,37147005, 699281100,14561835750,332913128625,8280095098275, 222659485448400,6434896997529000, 198909798356894625,6547761582390653625, 228681849947367316500,8445341134525197152250, 328822530412023653630625]

Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research