A006012 as tables, graphs or sounds

A006012 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`2`
`2`		`6`
`3`		`20`
`4`		`68`
`5`		`232`
`6`		`792`
`7`		`2704`
`8`		`9232`
`9`		`31520`
`10`		`107616`
`11`		`367424`
`12`		`1254464`
`13`		`4283008`
`14`		`14623104`
`15`		`49926400`
`16`		`170459392`
`17`		`581984768`
`18`		`1987020288`
`19`		`6784111616`
`20`		`23162405888`
`21`		`79081400320`
`22`		`270000789504`
`23`		`921840357376`
`24`		`3147359850496`

[1,2,6,20,68,232,792,2704,9232,31520,107616, 367424,1254464,4283008,14623104,49926400, 170459392,581984768,1987020288,6784111616, 23162405888,79081400320,270000789504,921840357376, 3147359850496]

Last modified December 1 19:22 EST 2009. Contains 167811 sequences.

AT&T Labs Research