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A180978
as a simple table
n
a(n)
1
1
2
3
3
10
4
121
5
3680
6
326650
7
91271990
8
74872992399
9
208579984612008
10
1748923742658486631
[1,3,10,121,3680,326650,91271990,74872992399, 208579984612008,1748923742658486631]