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A274552
as a simple table
n
a(n)
1
4
2
5
3
6
4
7
5
8
6
15
7
52
8
315
9
592
10
1155
11
2102272
12
815634435
[4,5,6,7,8,15,52,315,592,1155,2102272,815634435]
