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A277628
as a simple table
n
a(n)
1
1
2
3
3
21
4
936340943
5
10460353197
6
9374251222371
7
23326283250291
8
615790788171551
[1,3,21,936340943,10460353197,9374251222371, 23326283250291,615790788171551]