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A304986
as a simple table
n
a(n)
0
1
1
2
2
4
3
12
4
115
5
6834
6
7783198
7
2414627236078
8
56130437209370100252471
[1,2,4,12,115,6834,7783198,2414627236078, 56130437209370100252471]