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A255420
as a simple table
n
a(n)
0
1
1
2
2
3
3
5
4
11
5
37
6
181
7
1361
8
13927
9
183871
10
3005533
11
59045717
[1,2,3,5,11,37,181,1361,13927,183871,3005533, 59045717]