A013999 as tables, graphs or sounds

A013999 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`2`
`3`		`8`
`4`		`42`
`5`		`258`
`6`		`1824`
`7`		`14664`
`8`		`132360`
`9`		`1326120`
`10`		`14606640`
`11`		`175448160`
`12`		`2282469840`
`13`		`31972303440`
`14`		`479793807360`
`15`		`7679384173440`
`16`		`130586660507520`
`17`		`2351111258805120`
`18`		`44679858911251200`
`19`		`893744703503769600`

[1,1,2,8,42,258,1824,14664,132360,1326120, 14606640,175448160,2282469840,31972303440, 479793807360,7679384173440,130586660507520, 2351111258805120,44679858911251200, 893744703503769600]

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

AT&T Labs Research