A026156 as tables, graphs or sounds

A026156 formatted as a simple table:

`n`		`a(n)`
`2`		`1`
`3`		`4`
`4`		`20`
`5`		`111`
`6`		`616`
`7`		`3464`
`8`		`19656`
`9`		`112370`
`10`		`646272`
`11`		`3735324`
`12`		`21678696`
`13`		`126256361`
`14`		`737513400`
`15`		`4319243760`
`16`		`25352692620`
`17`		`149108262264`
`18`		`878502339712`
`19`		`5184007871160`
`20`		`30633757767144`
`21`		`181253849830625`

[1,4,20,111,616,3464,19656,112370,646272,3735324, 21678696,126256361,737513400,4319243760, 25352692620,149108262264,878502339712, 5184007871160,30633757767144,181253849830625]

Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research