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A183264
as a simple table
n
a(n)
1
0
2
2
3
15
4
64
5
220
6
672
7
1904
8
5120
9
13248
10
33280
11
81664
12
196608
13
465920
14
1089536
15
2519040
[0,2,15,64,220,672,1904,5120,13248,33280,81664, 196608,465920,1089536,2519040]
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Last modified May 25 05:37 EDT 2013. Contains 225644 sequences.