A023991 as tables, graphs or sounds

A023991 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`4`
`3`		`6`
`4`		`8`
`5`		`8`
`6`		`12`
`7`		`12`
`8`		`13`
`9`		`13`
`10`		`15`
`11`		`17`
`12`		`20`
`13`		`19`
`14`		`22`
`15`		`21`
`16`		`22`
`17`		`21`
`18`		`24`
`19`		`25`
`20`		`26`
`21`		`25`
`22`		`31`
`23`		`30`
`24`		`32`
`25`		`30`
`26`		`31`
`27`		`33`
`28`		`33`
`29`		`32`
`30`		`36`
`31`		`34`
`32`		`36`
`33`		`34`
`34`		`36`
`35`		`36`
`36`		`37`
`37`		`36`
`38`		`40`
`39`		`40`
`40`		`42`
`41`		`40`
`42`		`45`
`43`		`48`
`44`		`49`
`45`		`49`
`46`		`51`
`47`		`50`
`48`		`52`
`49`		`49`
`50`		`50`
`51`		`50`
`52`		`53`
`53`		`50`
`54`		`56`
`55`		`53`
`56`		`53`
`57`		`53`
`58`		`55`
`59`		`58`
`60`		`60`
`61`		`59`
`62`		`62`
`63`		`60`
`64`		`60`
`65`		`55`
`66`		`58`
`67`		`59`
`68`		`61`
`69`		`60`
`70`		`65`
`71`		`62`
`72`		`65`
`73`		`63`
`74`		`66`
`75`		`69`
`76`		`68`

[1,4,6,8,8,12,12,13,13,15,17,20,19,22,21,22,21,24, 25,26,25,31,30,32,30,31,33,33,32,36,34,36,34,36, 36,37,36,40,40,42,40,45,48,49,49,51,50,52,49,50, 50,53,50,56,53,53,53,55,58,60,59,62,60,60,55,58, 59,61,60,65,62,65,63,66,69,68]

Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

AT&T Labs Research