A015518 as tables, graphs or sounds

A015518 formatted as a simple table:

`n`		`a(n)`
`0`		`0`
`1`		`1`
`2`		`2`
`3`		`7`
`4`		`20`
`5`		`61`
`6`		`182`
`7`		`547`
`8`		`1640`
`9`		`4921`
`10`		`14762`
`11`		`44287`
`12`		`132860`
`13`		`398581`
`14`		`1195742`
`15`		`3587227`
`16`		`10761680`
`17`		`32285041`
`18`		`96855122`
`19`		`290565367`
`20`		`871696100`
`21`		`2615088301`
`22`		`7845264902`
`23`		`23535794707`
`24`		`70607384120`
`25`		`211822152361`
`26`		`635466457082`

[0,1,2,7,20,61,182,547,1640,4921,14762,44287, 132860,398581,1195742,3587227,10761680,32285041, 96855122,290565367,871696100,2615088301, 7845264902,23535794707,70607384120,211822152361, 635466457082]

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

AT&T Labs Research