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A257376
as a simple table
n
a(n)
1
1620784518619319025971
2
2639154464612254121531
3
3259125690557440336631
4
124211857692162527019731
[1620784518619319025971,2639154464612254121531, 3259125690557440336631,124211857692162527019731]