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A054377
as a simple table
n
a(n)
1
2
2
6
3
42
4
1806
5
47058
6
2214502422
7
52495396602
8
8490421583559688410706771261086
[2,6,42,1806,47058,2214502422,52495396602, 8490421583559688410706771261086]