A048990 as tables, graphs or sounds

A048990 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`2`
`2`		`14`
`3`		`132`
`4`		`1430`
`5`		`16796`
`6`		`208012`
`7`		`2674440`
`8`		`35357670`
`9`		`477638700`
`10`		`6564120420`
`11`		`91482563640`
`12`		`1289904147324`
`13`		`18367353072152`
`14`		`263747951750360`
`15`		`3814986502092304`
`16`		`55534064877048198`
`17`		`812944042149730764`

[1,2,14,132,1430,16796,208012,2674440,35357670, 477638700,6564120420,91482563640,1289904147324, 18367353072152,263747951750360,3814986502092304, 55534064877048198,812944042149730764]

Last modified December 19 21:04 EST 2009. Contains 171054 sequences.

AT&T Labs Research