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A299002
as a simple table
n
a(n)
1
1
2
8
3
94
4
1977
5
111695
6
9369586
7
1591404390
8
667156890263
9
490770543899625
[1,8,94,1977,111695,9369586,1591404390, 667156890263,490770543899625]