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A201378
as a simple table
n
a(n)
1
2
2
3
3
19
4
121
5
7148
6
326650
7
175765510
8
74872992399
9
400292326222730
10
1748923742658486631
[2,3,19,121,7148,326650,175765510,74872992399, 400292326222730,1748923742658486631]