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A198038
as a simple table
n
a(n)
1
1
2
4
3
48
4
1083
5
58754
6
6986232
7
1856160689
8
1127146150406
9
1548159743720858
[1,4,48,1083,58754,6986232,1856160689, 1127146150406,1548159743720858]