A031880 as tables, graphs or sounds

A031880 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`9`
`3`		`33`
`4`		`99`
`5`		`111`
`6`		`141`
`7`		`171`
`8`		`303`
`9`		`393`
`10`		`535`
`11`		`717`
`12`		`777`
`13`		`979`
`14`		`1441`
`15`		`1771`
`16`		`3003`
`17`		`3223`
`18`		`3663`
`19`		`5335`
`20`		`7447`
`21`		`9009`
`22`		`9339`
`23`		`9999`
`24`		`11011`
`25`		`11811`
`26`		`11911`
`27`		`12121`
`28`		`12321`
`29`		`12621`
`30`		`13531`
`31`		`14041`
`32`		`14541`
`33`		`14841`
`34`		`17671`
`35`		`18381`
`36`		`18681`
`37`		`19791`
`38`		`30303`
`39`		`31713`
`40`		`32223`

[1,9,33,99,111,141,171,303,393,535,717,777,979, 1441,1771,3003,3223,3663,5335,7447,9009,9339,9999, 11011,11811,11911,12121,12321,12621,13531,14041, 14541,14841,17671,18381,18681,19791,30303,31713, 32223]

Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

AT&T Labs Research