A015220 as tables, graphs or sounds

A015220 formatted as a simple table:

`n`		`a(n)`
`0`		`4`
`1`		`10`
`2`		`20`
`3`		`56`
`4`		`84`
`5`		`120`
`6`		`220`
`7`		`286`
`8`		`364`
`9`		`560`
`10`		`680`
`11`		`816`
`12`		`1140`
`13`		`1330`
`14`		`1540`
`15`		`2024`
`16`		`2300`
`17`		`2600`
`18`		`3276`
`19`		`3654`
`20`		`4060`
`21`		`4960`
`22`		`5456`
`23`		`5984`
`24`		`7140`
`25`		`7770`
`26`		`8436`
`27`		`9880`
`28`		`10660`
`29`		`11480`
`30`		`13244`
`31`		`14190`
`32`		`15180`
`33`		`17296`
`34`		`18424`
`35`		`19600`
`36`		`22100`
`37`		`23426`
`38`		`24804`
`39`		`27720`
`40`		`29260`

[4,10,20,56,84,120,220,286,364,560,680,816,1140, 1330,1540,2024,2300,2600,3276,3654,4060,4960,5456, 5984,7140,7770,8436,9880,10660,11480,13244,14190, 15180,17296,18424,19600,22100,23426,24804,27720, 29260]

Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research