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A195643
as a simple table
n
a(n)
1
1
2
1
3
3
4
19
5
391
6
25532
7
5539434
8
4116290300
9
10699674783969
10
98827025484631957
11
3284291571314714878300
[1,1,3,19,391,25532,5539434,4116290300, 10699674783969,98827025484631957, 3284291571314714878300]