A038720 as tables, graphs or sounds

A038720 formatted as a simple table:

`n`		`a(n)`
`1`		`2`
`2`		`5`
`3`		`18`
`4`		`84`
`5`		`480`
`6`		`3240`
`7`		`25200`
`8`		`221760`
`9`		`2177280`
`10`		`23587200`
`11`		`279417600`
`12`		`3592512000`
`13`		`49816166400`
`14`		`741015475200`
`15`		`11769069312000`
`16`		`198766503936000`
`17`		`3556874280960000`
`18`		`67224923910144000`
`19`		`1338096104497152000`

[2,5,18,84,480,3240,25200,221760,2177280,23587200, 279417600,3592512000,49816166400,741015475200, 11769069312000,198766503936000,3556874280960000, 67224923910144000,1338096104497152000]

Last modified December 6 13:45 EST 2009. Contains 170429 sequences.

AT&T Labs Research