A107668 as tables, graphs or sounds

A107668 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`4`
`2`		`45`
`3`		`816`
`4`		`20225`
`5`		`632700`
`6`		`23836540`
`7`		`1048592640`
`8`		`52696514169`
`9`		`2976295383100`
`10`		`186548057815801`
`11`		`12845016620629488`
`12`		`963644465255618276`
`13`		`78224633235142116240`
`14`		`6830914919397129328500`
`15`		`638477522900795994967040`

[1,4,45,816,20225,632700,23836540,1048592640, 52696514169,2976295383100,186548057815801, 12845016620629488,963644465255618276, 78224633235142116240,6830914919397129328500, 638477522900795994967040]

Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

AT&T Labs Research