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A229771
as a simple table
n
a(n)
1
4
2
60
3
3232
4
1058494
5
3062815568
6
90462380211862
7
29201160476766771330
8
108134253835820664368578112
[4,60,3232,1058494,3062815568,90462380211862, 29201160476766771330,108134253835820664368578112]