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A305679
as a simple table
n
a(n)
1
1
2
4
3
25
4
1595
5
383910
6
351440611
7
1172824606532
8
14227138873003015
9
624906012671792336577
[1,4,25,1595,383910,351440611,1172824606532, 14227138873003015,624906012671792336577]