A001689 as tables, graphs or sounds

A001689 formatted as a simple table:

`n`		`a(n)`
`-1`		`8`
`0`		`44`
`1`		`309`
`2`		`2428`
`3`		`21234`
`4`		`205056`
`5`		`2170680`
`6`		`25022880`
`7`		`312273360`
`8`		`4196666880`
`9`		`60451816320`
`10`		`929459059200`
`11`		`15196285843200`
`12`		`263309095526400`
`13`		`4820517384883200`
`14`		`92987329455820800`
`15`		`1885246675183872000`
`16`		`40080616912207872000`
`17`		`891690242177839104000`

[8,44,309,2428,21234,205056,2170680,25022880, 312273360,4196666880,60451816320,929459059200, 15196285843200,263309095526400,4820517384883200, 92987329455820800,1885246675183872000, 40080616912207872000,891690242177839104000]

Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research