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A203198
as a simple table
n
a(n)
1
1
2
5
3
26
4
273
5
6471
6
310314
7
28982276
8
5533436740
9
2118285935865
10
1626014944250437
[1,5,26,273,6471,310314,28982276,5533436740, 2118285935865,1626014944250437]