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A002932
as a simple table
n
a(n)
0
1
1
4
2
12
3
28
4
68
5
164
6
396
7
940
8
2244
9
5324
10
12668
11
29940
12
71012
13
167468
14
396204
[1,4,12,28,68,164,396,940,2244,5324,12668,29940, 71012,167468,396204]