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A091159
as a simple table
n
a(n)
2
1
3
11
4
261
5
9694
6
502110
7
33064966
8
2642657228
9
248639631948
10
26941775019280
[1,11,261,9694,502110,33064966,2642657228, 248639631948,26941775019280]