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A184347
as a simple table
n
a(n)
1
1
2
1
3
2
4
2
5
8
6
47
7
124
8
1371
9
5439
10
34449
11
189065
12
862990
13
5437663
14
23939996
15
139734236
[1,1,2,2,8,47,124,1371,5439,34449,189065,862990, 5437663,23939996,139734236]