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A250520
as a simple table
n
a(n)
1
50
2
1180
3
21955
4
300131
5
3183434
6
27910024
7
212707851
8
1462376991
9
9314700106
10
56025183452
11
322542598187
[50,1180,21955,300131,3183434,27910024,212707851, 1462376991,9314700106,56025183452,322542598187]