A011900 as tables, graphs or sounds

A011900 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`3`
`2`		`15`
`3`		`85`
`4`		`493`
`5`		`2871`
`6`		`16731`
`7`		`97513`
`8`		`568345`
`9`		`3312555`
`10`		`19306983`
`11`		`112529341`
`12`		`655869061`
`13`		`3822685023`
`14`		`22280241075`
`15`		`129858761425`
`16`		`756872327473`
`17`		`4411375203411`
`18`		`25711378892991`
`19`		`149856898154533`
`20`		`873430010034205`

[1,3,15,85,493,2871,16731,97513,568345,3312555, 19306983,112529341,655869061,3822685023, 22280241075,129858761425,756872327473, 4411375203411,25711378892991,149856898154533, 873430010034205]

Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

AT&T Labs Research