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A365559
as a simple table
n
a(n)
1
1
2
2
3
7
4
28
5
160
6
1085
7
8403
8
69824
9
607988
10
5448444
11
49846437
[1,2,7,28,160,1085,8403,69824,607988,5448444, 49846437]
