A001508
formatted as a simple table:
n
a(n)
1
0
2
0
3
0
4
0
5
13
6
252
7
3740
8
51300
9
685419
10
9095856
11
120872850
12
1614234960
13
21697730849
[0,0,0,0,13,252,3740,51300,685419,9095856, 120872850,1614234960,21697730849]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 20 16:54 EST 2009. Contains 171081 sequences.
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