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A000836
as a simple table
n
a(n)
1
13
2
87
3
4148
4
153668757
5
41269612629126375351
6
810896098877923596128062174904361421866219158
[13,87,4148,153668757,41269612629126375351, 810896098877923596128062174904361421866219158]