A007123 as tables, graphs or sounds

A007123 formatted as a simple table:

`n`		`a(n)`
`1`		`1`
`2`		`1`
`3`		`2`
`4`		`4`
`5`		`10`
`6`		`26`
`7`		`76`
`8`		`232`
`9`		`750`
`10`		`2494`
`11`		`8524`
`12`		`29624`
`13`		`104468`
`14`		`372308`
`15`		`1338936`
`16`		`4850640`
`17`		`17685270`
`18`		`64834550`
`19`		`238843660`
`20`		`883677784`
`21`		`3282152588`
`22`		`12233309868`
`23`		`45741634536`
`24`		`171530482864`
`25`		`644953425740`
`26`		`2430975800876`

[1,1,2,4,10,26,76,232,750,2494,8524,29624,104468, 372308,1338936,4850640,17685270,64834550, 238843660,883677784,3282152588,12233309868, 45741634536,171530482864,644953425740, 2430975800876]

Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

AT&T Labs Research