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A319121
as a simple table
n
a(n)
1
1
2
2
3
5
4
18
5
74
6
344
7
1679
8
8548
9
44690
10
238691
11
1295990
12
7132509
[1,2,5,18,74,344,1679,8548,44690,238691,1295990, 7132509]