A004253 as tables, graphs or sounds

A004253 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`4`
`3`		`19`
`4`		`91`
`5`		`436`
`6`		`2089`
`7`		`10009`
`8`		`47956`
`9`		`229771`
`10`		`1100899`
`11`		`5274724`
`12`		`25272721`
`13`		`121088881`
`14`		`580171684`
`15`		`2779769539`
`16`		`13318676011`
`17`		`63813610516`
`18`		`305749376569`
`19`		`1464933272329`
`20`		`7018916985076`
`21`		`33629651653051`
`22`		`161129341280179`

[1,4,19,91,436,2089,10009,47956,229771,1100899, 5274724,25272721,121088881,580171684,2779769539, 13318676011,63813610516,305749376569, 1464933272329,7018916985076,33629651653051, 161129341280179]

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research