A001921 as tables, graphs or sounds

A001921 formatted as a simple table:

`n`		`a(n)`
`0`		`0`
`1`		`7`
`2`		`104`
`3`		`1455`
`4`		`20272`
`5`		`282359`
`6`		`3932760`
`7`		`54776287`
`8`		`762935264`
`9`		`10626317415`
`10`		`148005508552`
`11`		`2061450802319`
`12`		`28712305723920`
`13`		`399910829332567`
`14`		`5570039304932024`
`15`		`77580639439715775`
`16`		`1080558912851088832`

[0,7,104,1455,20272,282359,3932760,54776287, 762935264,10626317415,148005508552,2061450802319, 28712305723920,399910829332567,5570039304932024, 77580639439715775,1080558912851088832]

Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research