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A186751
as a simple table
n
a(n)
0
3
1
5
2
21
3
437
4
190965
5
36467631221
6
1329888126870853950837
7
1768602429992068534155014726612412013000565
[3,5,21,437,190965,36467631221, 1329888126870853950837, 1768602429992068534155014726612412013000565]