A026580 as tables, graphs or sounds

A026580 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`2`
`2`		`5`
`3`		`12`
`4`		`30`
`5`		`75`
`6`		`189`
`7`		`478`
`8`		`1211`
`9`		`3076`
`10`		`7818`
`11`		`19901`
`12`		`50680`
`13`		`129179`
`14`		`329383`
`15`		`840336`
`16`		`2144540`
`17`		`5474889`
`18`		`13980493`
`19`		`35709394`
`20`		`91228015`
`21`		`233108456`
`22`		`595740568`
`23`		`1522725379`
`24`		`3892624055`
`25`		`9952119054`
`26`		`25446913766`
`27`		`65072487645`

[1,2,5,12,30,75,189,478,1211,3076,7818,19901, 50680,129179,329383,840336,2144540,5474889, 13980493,35709394,91228015,233108456,595740568, 1522725379,3892624055,9952119054,25446913766, 65072487645]

Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research