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A184317
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
2
6
18
7
139
8
1056
9
7826
10
54515
11
381432
12
2731297
13
19018976
14
134976119
15
935869825
[1,1,1,2,2,18,139,1056,7826,54515,381432,2731297, 19018976,134976119,935869825]