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A146618
as a simple table
n
a(n)
1
1
2
1
3
1
4
13
5
73
6
385
7
4155
8
53517
9
1280671
10
42489917
11
1853052759
12
122748998951
13
11481223465221
[1,1,1,13,73,385,4155,53517,1280671,42489917, 1853052759,122748998951,11481223465221]