A121102
formatted as a simple table:
n
a(n)
1
0
2
0
3
0
4
4
5
24
6
144
7
744
8
3844
9
19344
10
97344
[0,0,0,4,24,144,744,3844,19344,97344]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
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