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A000425 formatted as a simple table:

n a(n)
1 2
2 0
3 0
4 8
5 30
6 192
7 1344
8 10800
9 97434
10 976000
11 10749024
12 129103992
13 1679495350
14 23525384064
15 353028802560
16 5650370001120
17 96082828074162
18 1729886440780800
19 32874134679574208
20 657589108734075240
21 13811277748363437006
22 303884178002526338624

[2,0,0,8,30,192,1344,10800,97434,976000,10749024,
 129103992,1679495350,23525384064,353028802560,
 5650370001120,96082828074162,1729886440780800,
 32874134679574208,657589108734075240,
 13811277748363437006,303884178002526338624]

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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