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A038560
as a simple table
n
a(n)
0
2
1
3
2
5
3
13
4
39
5
135
6
527
7
2277
8
10749
9
54905
10
301111
11
1761803
[2,3,5,13,39,135,527,2277,10749,54905,301111, 1761803]