A001801 as tables, graphs or sounds

A001801 formatted as a simple table:

`n`		`a(n)`
`0`		`3`
`1`		`15`
`2`		`105`
`3`		`315`
`4`		`6930`
`5`		`18018`
`6`		`90090`
`7`		`218790`
`8`		`2078505`
`9`		`4849845`
`10`		`22309287`
`11`		`50702925`
`12`		`1825305300`
`13`		`4071834900`
`14`		`18032411700`
`15`		`39671305740`
`16`		`347123925225`
`17`		`755505013725`
`18`		`3273855059475`
`19`		`7064634602025`
`20`		`121511715154830`

[3,15,105,315,6930,18018,90090,218790,2078505, 4849845,22309287,50702925,1825305300,4071834900, 18032411700,39671305740,347123925225,755505013725, 3273855059475,7064634602025,121511715154830]

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

AT&T Labs Research