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A165210
as a simple table
n
a(n)
1
7
2
43
3
55987
4
7369130657357778596659
5
3546245297457217493590449191748546458005595187661976371
[7,43,55987,7369130657357778596659, 35462452974572174935904491917485464580055951876619\ 76371]