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A257108
as a simple table
n
a(n)
0
2
1
3
2
7
3
47
4
241
5
2887
6
57119
7
217069
8
37923937
9
211014919
10
221167421
11
221167421
[2,3,7,47,241,2887,57119,217069,37923937, 211014919,221167421,221167421]