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A153344
as a simple table
n
a(n)
0
1
1
1
2
3
3
9
4
33
5
137
6
633
7
3201
8
17525
9
102997
10
645413
11
4288331
12
30072815
[1,1,3,9,33,137,633,3201,17525,102997,645413, 4288331,30072815]