A052408
formatted as a simple table:
n
a(n)
1
0
2
0
3
0
4
1
5
1
6
3
7
6
8
20
9
48
10
164
11
551
12
2176
13
9985
14
46969
15
253285
16
1388694
[0,0,0,1,1,3,6,20,48,164,551,2176,9985,46969, 253285,1388694]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 19 12:50 EST 2009. Contains 171053 sequences.
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