A018031 as tables, graphs or sounds

A018031 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`3`
`2`		`7`
`3`		`19`
`4`		`51`
`5`		`135`
`6`		`361`
`7`		`963`
`8`		`2570`
`9`		`6859`
`10`		`18303`
`11`		`48839`
`12`		`130321`
`13`		`347749`
`14`		`927933`
`15`		`2476099`
`16`		`6607227`
`17`		`17630734`
`18`		`47045881`
`19`		`125537306`
`20`		`334983955`
`21`		`893871739`
`22`		`2385208822`
`23`		`6364695153`
`24`		`16983563041`
`25`		`45318967620`

[1,3,7,19,51,135,361,963,2570,6859,18303,48839, 130321,347749,927933,2476099,6607227,17630734, 47045881,125537306,334983955,893871739,2385208822, 6364695153,16983563041,45318967620]

Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

AT&T Labs Research