A001693 as tables, graphs or sounds

A001693 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`7`
`2`		`21`
`3`		`112`
`4`		`588`
`5`		`3360`
`6`		`19544`
`7`		`117648`
`8`		`720300`
`9`		`4483696`
`10`		`28245840`
`11`		`179756976`
`12`		`1153430600`
`13`		`7453000800`
`14`		`48444446376`
`15`		`316504099520`
`16`		`2077057800300`
`17`		`13684147881600`
`18`		`90467419857752`
`19`		`599941851861744`

[1,7,21,112,588,3360,19544,117648,720300,4483696, 28245840,179756976,1153430600,7453000800, 48444446376,316504099520,2077057800300, 13684147881600,90467419857752,599941851861744]

Last modified December 3 22:15 EST 2009. Contains 170310 sequences.

AT&T Labs Research