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A155236
as a simple table
n
a(n)
4
1
5
13
6
37
7
210
8
1538
9
9864
10
106941
11
1433656
12
22817924
13
508623094
14
13424571091
[1,13,37,210,1538,9864,106941,1433656,22817924, 508623094,13424571091]