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A355598
as a simple table
n
a(n)
1
3
2
17
3
131
4
659
5
503
6
9833
7
49603
8
327317
9
13900147
10
144229223
11
5872276013
[3,17,131,659,503,9833,49603,327317,13900147, 144229223,5872276013]