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A193877
as a simple table
n
a(n)
1
7
2
216
3
3636
4
152574
5
21331380
6
7767784824
7
7384820647122
8
18209251766239734
[7,216,3636,152574,21331380,7767784824, 7384820647122,18209251766239734]