A007681 as tables, graphs or sounds

A007681 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`9`
`2`		`50`
`3`		`294`
`4`		`1944`
`5`		`14520`
`6`		`121680`
`7`		`1134000`
`8`		`11652480`
`9`		`130999680`
`10`		`1600300800`
`11`		`21115987200`
`12`		`299376000000`
`13`		`4539498163200`
`14`		`73316942899200`
`15`		`1256675067648000`
`16`		`22784918188032000`
`17`		`435717099417600000`

[1,9,50,294,1944,14520,121680,1134000,11652480, 130999680,1600300800,21115987200,299376000000, 4539498163200,73316942899200,1256675067648000, 22784918188032000,435717099417600000]

Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research