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A172027
as a simple table
n
a(n)
1
1
2
7
3
169
4
86191
5
22286924017
6
1490120946485455020919
7
6661381305464124918785090511089856547876441
[1,7,169,86191,22286924017,1490120946485455020919, 6661381305464124918785090511089856547876441]