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A090660
as a simple table
n
a(n)
1
3
2
4
3
12
4
28
5
38
6
42
7
74
8
78
9
117
10
155
11
321
12
341
13
400
14
428
15
873
16
1478
17
6381
18
26952
[3,4,12,28,38,42,74,78,117,155,321,341,400,428, 873,1478,6381,26952]