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A202544
as a simple table
n
a(n)
1
1
2
2
3
18
4
1094
5
658492
6
5534917394
7
876480920594230
8
3399581643395993926522
[1,2,18,1094,658492,5534917394,876480920594230, 3399581643395993926522]