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A058238
as a simple table
n
a(n)
1
4
2
6
3
8
4
20
5
22
6
32
7
46
8
56
9
104
10
200
11
238
12
284
13
764
14
958
15
1820
[4,6,8,20,22,32,46,56,104,200,238,284,764,958, 1820]