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A363090
as a simple table
n
a(n)
1
1
2
3
3
12
4
52
5
237
6
1113
7
5339
8
26011
9
128247
10
638346
11
3201967
12
16164384
13
82044151
[1,3,12,52,237,1113,5339,26011,128247,638346, 3201967,16164384,82044151]