A038721 as tables, graphs or sounds

A038721 formatted as a simple table:

`n`		`a(n)`
`1`		`2`
`2`		`18`
`3`		`110`
`4`		`570`
`5`		`2702`
`6`		`12138`
`7`		`52670`
`8`		`223290`
`9`		`931502`
`10`		`3842058`
`11`		`15718430`
`12`		`63928410`
`13`		`258885902`
`14`		`1045076778`
`15`		`4208939390`
`16`		`16921719930`
`17`		`67944897902`
`18`		`272553908298`
`19`		`1092539107550`
`20`		`4377127901850`
`21`		`17529428119502`
`22`		`70180466208618`

[2,18,110,570,2702,12138,52670,223290,931502, 3842058,15718430,63928410,258885902,1045076778, 4208939390,16921719930,67944897902,272553908298, 1092539107550,4377127901850,17529428119502, 70180466208618]

Last modified December 4 15:11 EST 2009. Contains 170347 sequences.

AT&T Labs Research