A121148
formatted as a simple table:
n
a(n)
3
0
4
0
5
0
6
16
7
113
8
750
9
4809
10
31263
11
204670
[0,0,0,16,113,750,4809,31263,204670]
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N. J. A. Sloane
(
njas@research.att.com
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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