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A078564
as a simple table
n
a(n)
1
1
2
1
3
2
4
6
5
20
6
93
7
515
8
3701
9
32714
10
359289
11
4847830
12
80064871
13
1607606989
14
38983675574
[1,1,2,6,20,93,515,3701,32714,359289,4847830, 80064871,1607606989,38983675574]