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A223638
as a simple table
n
a(n)
1
2
2
16
3
218
4
2962
5
36947
6
428187
7
4682514
8
49045356
9
497721760
10
4944054774
[2,16,218,2962,36947,428187,4682514,49045356, 497721760,4944054774]