A108704 as tables, graphs or sounds

A108704 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`4`
`3`		`18`
`4`		`126`
`5`		`1110`
`6`		`12120`
`7`		`156660`
`8`		`2341500`
`9`		`39701340`
`10`		`752839920`
`11`		`15785181720`
`12`		`362606123880`
`13`		`9055825538760`
`14`		`244296192460320`
`15`		`7079382509799600`
`16`		`219321853964413200`
`17`		`7233629128601475600`
`18`		`253054306933115688000`

[1,1,4,18,126,1110,12120,156660,2341500,39701340, 752839920,15785181720,362606123880,9055825538760, 244296192460320,7079382509799600, 219321853964413200,7233629128601475600, 253054306933115688000]

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

AT&T Labs Research