A075308 as tables, graphs or sounds

A075308 formatted as a simple table:

`n`		`a(n)`
`1`		`4`
`2`		`8`
`3`		`28`
`4`		`84`
`5`		`242`
`6`		`744`
`7`		`2284`
`8`		`7096`
`9`		`22179`
`10`		`69561`
`11`		`218759`
`12`		`689206`
`13`		`2173942`
`14`		`6862783`
`15`		`21676671`
`16`		`68493153`
`17`		`216477260`
`18`		`684309327`
`19`		`2163434093`
`20`		`6840212693`
`21`		`21628140126`
`22`		`68388775913`
`23`		`216252650605`
`24`		`683825838922`

[4,8,28,84,242,744,2284,7096,22179,69561,218759, 689206,2173942,6862783,21676671,68493153, 216477260,684309327,2163434093,6840212693, 21628140126,68388775913,216252650605, 683825838922]

Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research