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A109887
as a simple table
n
a(n)
1
3
2
4
3
10
4
20
5
44
6
60
7
583
8
677
9
947
10
1182
11
12048
12
16018
13
74316
[3,4,10,20,44,60,583,677,947,1182,12048,16018, 74316]