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A139203
as a simple table
n
a(n)
1
4
2
6
3
8
4
10
5
11
6
16
7
19
8
47
9
66
10
183
11
376
12
507
13
1081
14
1204
15
12111
16
23181
[4,6,8,10,11,16,19,47,66,183,376,507,1081,1204, 12111,23181]