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A300308
as a simple table
n
a(n)
1
1
2
7
3
20
4
211
5
15171
6
1676663
7
543024998
8
558233828840
9
1538341448830389
[1,7,20,211,15171,1676663,543024998,558233828840, 1538341448830389]