A023431 as tables, graphs or sounds

A023431 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`1`
`2`		`1`
`3`		`2`
`4`		`4`
`5`		`7`
`6`		`13`
`7`		`26`
`8`		`52`
`9`		`104`
`10`		`212`
`11`		`438`
`12`		`910`
`13`		`1903`
`14`		`4009`
`15`		`8494`
`16`		`18080`
`17`		`38656`
`18`		`82988`
`19`		`178802`
`20`		`386490`
`21`		`837928`
`22`		`1821664`
`23`		`3970282`
`24`		`8673258`
`25`		`18987930`
`26`		`41652382`
`27`		`91539466`
`28`		`201525238`
`29`		`444379907`
`30`		`981384125`
`31`		`2170416738`
`32`		`4806513660`

[1,1,1,2,4,7,13,26,52,104,212,438,910,1903,4009, 8494,18080,38656,82988,178802,386490,837928, 1821664,3970282,8673258,18987930,41652382, 91539466,201525238,444379907,981384125,2170416738, 4806513660]

Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

AT&T Labs Research