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A058219
as a simple table
n
a(n)
1
4
2
6
3
12
4
14
5
28
6
40
7
54
8
78
9
86
10
246
11
390
12
702
13
854
14
1096
[4,6,12,14,28,40,54,78,86,246,390,702,854,1096]