A003168 as tables, graphs or sounds

A003168 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`4`
`3`		`21`
`4`		`126`
`5`		`818`
`6`		`5594`
`7`		`39693`
`8`		`289510`
`9`		`2157150`
`10`		`16348960`
`11`		`125642146`
`12`		`976789620`
`13`		`7668465964`
`14`		`60708178054`
`15`		`484093913917`
`16`		`3884724864390`
`17`		`31348290348086`
`18`		`254225828706248`
`19`		`2070856216759478`
`20`		`16936016649259364`

[1,1,4,21,126,818,5594,39693,289510,2157150, 16348960,125642146,976789620,7668465964, 60708178054,484093913917,3884724864390, 31348290348086,254225828706248,2070856216759478, 16936016649259364]

Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research