A001789 as tables, graphs or sounds

A001789 formatted as a simple table:

`n`		`a(n)`
`3`		`1`
`4`		`8`
`5`		`40`
`6`		`160`
`7`		`560`
`8`		`1792`
`9`		`5376`
`10`		`15360`
`11`		`42240`
`12`		`112640`
`13`		`292864`
`14`		`745472`
`15`		`1863680`
`16`		`4587520`
`17`		`11141120`
`18`		`26738688`
`19`		`63504384`
`20`		`149422080`
`21`		`348651520`
`22`		`807403520`
`23`		`1857028096`
`24`		`4244635648`
`25`		`9646899200`
`26`		`21810380800`
`27`		`49073356800`
`28`		`109924319232`

[1,8,40,160,560,1792,5376,15360,42240,112640, 292864,745472,1863680,4587520,11141120,26738688, 63504384,149422080,348651520,807403520,1857028096, 4244635648,9646899200,21810380800,49073356800, 109924319232]

Last modified December 6 11:04 EST 2009. Contains 170427 sequences.

AT&T Labs Research