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A196011
as a simple table
n
a(n)
1
1
2
1
3
2
4
25
5
106
6
708
7
22711
8
670449
9
44864449
10
5122273171
11
1106078073333
12
426788297174150
[1,1,2,25,106,708,22711,670449,44864449, 5122273171,1106078073333,426788297174150]