A042887 as tables, graphs or sounds

A042887 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`4`
`2`		`9`
`3`		`40`
`4`		`2489`
`5`		`9996`
`6`		`22481`
`7`		`99920`
`8`		`6217521`
`9`		`24970004`
`10`		`56157529`
`11`		`249600120`
`12`		`15531364969`
`13`		`62375059996`
`14`		`140281484961`
`15`		`623500999840`
`16`		`38797343475041`
`17`		`155812874900004`
`18`		`350423093275049`
`19`		`1557505248000200`

[1,4,9,40,2489,9996,22481,99920,6217521,24970004, 56157529,249600120,15531364969,62375059996, 140281484961,623500999840,38797343475041, 155812874900004,350423093275049,1557505248000200]

Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research