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A036972
as a simple table
n
a(n)
1
1
2
2
3
3
4
11
5
14
6
137
7
1005
8
5324
9
6486
10
33326
11
1847020051726
12
19899051754834984670
[1,2,3,11,14,137,1005,5324,6486,33326, 1847020051726,19899051754834984670]