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A147523
as a simple table
n
a(n)
1
3
2
8
3
37
4
195
5
1159
6
6951
7
42421
8
261430
9
1631123
10
10238173
11
64536808
[3,8,37,195,1159,6951,42421,261430,1631123, 10238173,64536808]