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A058775
as a simple table
n
a(n)
1
2
2
6
3
8
4
20
5
54
6
68
7
468
8
648
9
1100
10
1374
11
14072
12
17790
13
20038
14
27192
15
42692
[2,6,8,20,54,68,468,648,1100,1374,14072,17790, 20038,27192,42692]