A001688 as tables, graphs or sounds

A001688 formatted as a simple table:

`n`		`a(n)`
`-1`		`1`
`0`		`9`
`1`		`53`
`2`		`362`
`3`		`2790`
`4`		`24024`
`5`		`229080`
`6`		`2399760`
`7`		`27422640`
`8`		`339696000`
`9`		`4536362880`
`10`		`64988179200`
`11`		`994447238400`
`12`		`16190733081600`
`13`		`279499828608000`
`14`		`5100017213491200`
`15`		`98087346669312000`
`16`		`1983334021853184000`
`17`		`42063950934061056000`
`18`		`933754193111900160000`

[1,9,53,362,2790,24024,229080,2399760,27422640, 339696000,4536362880,64988179200,994447238400, 16190733081600,279499828608000,5100017213491200, 98087346669312000,1983334021853184000, 42063950934061056000,933754193111900160000]

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

AT&T Labs Research