A018886 as tables, graphs or sounds

A018886 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`7`
`3`		`23`
`4`		`79`
`5`		`223`
`6`		`703`
`7`		`2175`
`8`		`6399`
`9`		`19455`
`10`		`58367`
`11`		`176127`
`12`		`528383`
`13`		`1589247`
`14`		`4767743`
`15`		`14319615`
`16`		`42991615`
`17`		`129105919`
`18`		`387186687`
`19`		`1161822207`
`20`		`3486515199`
`21`		`10458497023`
`22`		`31377588223`
`23`		`94136958975`
`24`		`282427654143`
`25`		`847282962431`
`26`		`2541815332863`

[1,7,23,79,223,703,2175,6399,19455,58367,176127, 528383,1589247,4767743,14319615,42991615, 129105919,387186687,1161822207,3486515199, 10458497023,31377588223,94136958975,282427654143, 847282962431,2541815332863]

Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

AT&T Labs Research