A001800 as tables, graphs or sounds

A001800 formatted as a simple table:

`n`		`a(n)`
`0`		`1`
`1`		`3`
`2`		`30`
`3`		`70`
`4`		`315`
`5`		`693`
`6`		`12012`
`7`		`25740`
`8`		`109395`
`9`		`230945`
`10`		`1939938`
`11`		`4056234`
`12`		`16900975`
`13`		`35102025`
`14`		`1163381400`
`15`		`2404321560`
`16`		`9917826435`
`17`		`20419054425`
`18`		`167890003050`
`19`		`344616322050`
`20`		`1412926920405`
`21`		`2893136075115`
`22`		`47342226683700`

[1,3,30,70,315,693,12012,25740,109395,230945, 1939938,4056234,16900975,35102025,1163381400, 2404321560,9917826435,20419054425,167890003050, 344616322050,1412926920405,2893136075115, 47342226683700]

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

AT&T Labs Research