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A123625
as a simple table
n
a(n)
1
2
2
9
3
185
4
5387
5
29837
6
1808757
7
33135829
8
67841719
9
4605386587
10
42271385
11
256198086973
12
177455670313
[2,9,185,5387,29837,1808757,33135829,67841719, 4605386587,42271385,256198086973,177455670313]