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A271679
as a simple table
n
a(n)
1
1
2
5
3
43
4
1060
5
52748
6
7094704
7
2145306564
8
1620658809592
9
2911303191478512
10
12781455928074495792
[1,5,43,1060,52748,7094704,2145306564, 1620658809592,2911303191478512, 12781455928074495792]