A125721
formatted as a simple table:
n
a(n)
0
2
1
2
2
2
3
3
4
6
5
15
6
48
7
168
8
840
9
4536
10
26880
11
147840
12
1209600
[2,2,2,3,6,15,48,168,840,4536,26880,147840, 1209600]
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(
njas@research.att.com
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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