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A239412
as a simple table
n
a(n)
1
4
2
6
3
8
4
16
5
18
6
92
7
254
8
258
9
660
10
1850
11
2496
12
2774
13
2832
14
7430
15
28540
16
32124
[4,6,8,16,18,92,254,258,660,1850,2496,2774,2832, 7430,28540,32124]