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A303507
as a simple table
n
a(n)
1
1
2
8
3
78
4
1596
5
72890
6
8883058
7
2346396384
8
1203039901394
9
1490405412540557
[1,8,78,1596,72890,8883058,2346396384, 1203039901394,1490405412540557]