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A003305
as a simple table
n
a(n)
4
2
5
8
6
40
7
208
8
1120
9
6200
10
35236
11
204664
12
1210392
13
7266824
14
44184288
[2,8,40,208,1120,6200,35236,204664,1210392, 7266824,44184288]