A072820 as tables, graphs or sounds

A072820 formatted as a simple table:

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

[1,1,3,3,5,4,5,5,7,6,9,8,9,9,11,10,11,11,13,12,13, 13,15,14,17,15,17,16,17,17,19,18,19,19,21,20,23, 21,23,22,23,23,25,24,25,25,27,26,27,27,29,28,29, 28,29,29,31,30,31,31,33,32,33,33,35,33,35,34,37, 35,37,36,37,37]

Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

AT&T Labs Research