A011820 as tables, graphs or sounds

A011820 formatted as a simple table:

`n`		`a(n)`
`1`		`2`
`2`		`6`
`3`		`32`
`4`		`203`
`5`		`1144`
`6`		`5345`
`7`		`20926`
`8`		`70506`
`9`		`209746`
`10`		`562727`
`11`		`1384758`
`12`		`3167606`
`13`		`6807620`
`14`		`13863904`
`15`		`26941700`
`16`		`50245591`
`17`		`90358146`
`18`		`157312324`
`19`		`266040452`
`20`		`438299013`
`21`		`705186944`
`22`		`1110395771`
`23`		`1714352818`
`24`		`2599444040`
`25`		`3876530866`

[2,6,32,203,1144,5345,20926,70506,209746,562727, 1384758,3167606,6807620,13863904,26941700, 50245591,90358146,157312324,266040452,438299013, 705186944,1110395771,1714352818,2599444040, 3876530866]

Last modified December 4 23:11 EST 2009. Contains 170347 sequences.

AT&T Labs Research