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A092838
as a simple table
n
a(n)
1
5
2
61
3
277
4
23489580527043108252017828576198947741
5
5516994249383296071214195242422482492286460673697
[5,61,277,23489580527043108252017828576198947741, 5516994249383296071214195242422482492286460673697]