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A147155
as a simple table
n
a(n)
1
1
2
1
3
1
4
9
5
33
6
113
7
789
8
14705
9
402015
10
10087297
11
406840323
12
29140240709
13
3363961380903
[1,1,1,9,33,113,789,14705,402015,10087297, 406840323,29140240709,3363961380903]