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A318418
as a simple table
n
a(n)
1
1
2
2
3
2
4
18
5
129
6
783
7
11802
8
236755
9
5897333
10
182618347
11
7672658026
12
436957466532
[1,2,2,18,129,783,11802,236755,5897333,182618347, 7672658026,436957466532]