A156431 as tables, graphs or sounds

A156431 formatted as a simple table:

`n`		`a(n)`
`2`		`1`
`3`		`0`
`4`		`2`
`5`		`0`
`6`		`12`
`7`		`0`
`8`		`90`
`9`		`0`
`10`		`810`
`11`		`0`
`12`		`8940`
`13`		`0`
`14`		`116760`
`15`		`0`
`16`		`1756860`
`17`		`0`
`18`		`29933820`
`19`		`0`
`20`		`569744280`
`21`		`0`
`22`		`11981526480`
`23`		`0`
`24`		`275893362360`
`25`		`0`
`26`		`6903968231160`
`27`		`0`
`28`		`186558764792400`
`29`		`0`
`30`		`5413973807642400`

[1,0,2,0,12,0,90,0,810,0,8940,0,116760,0,1756860, 0,29933820,0,569744280,0,11981526480,0, 275893362360,0,6903968231160,0,186558764792400,0, 5413973807642400]

Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

AT&T Labs Research