A145223
formatted as a simple table:
n
a(n)
2
0
3
0
4
6
5
0
6
90
7
420
8
3780
9
33264
10
333900
11
3670920
12
44054010
13
572697840
14
8017775766
[0,0,6,0,90,420,3780,33264,333900,3670920, 44054010,572697840,8017775766]
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Maintained by
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(
njas@research.att.com
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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
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