A000680 as tables, graphs or sounds

A000680 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`6`
`3`		`90`
`4`		`2520`
`5`		`113400`
`6`		`7484400`
`7`		`681080400`
`8`		`81729648000`
`9`		`12504636144000`
`10`		`2375880867360000`
`11`		`548828480360160000`
`12`		`151476660579404160000`
`13`		`49229914688306352000000`
`14`		`18608907752179801056000000`
`15`		`8094874872198213459360000000`
`16`		`4015057936610313875842560000000`

[1,1,6,90,2520,113400,7484400,681080400, 81729648000,12504636144000,2375880867360000, 548828480360160000,151476660579404160000, 49229914688306352000000, 18608907752179801056000000, 8094874872198213459360000000, 4015057936610313875842560000000]

Last modified December 17 19:39 EST 2009. Contains 170821 sequences.

AT&T Labs Research