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A273809 as a simple table

na(n)
1491
2503
3743
44294967783
5115792089237316195423570985008687907853269984665640564039457584007913129640423

[491,503,743,4294967783,
 11579208923731619542357098500868790785326998466564\
 0564039457584007913129640423]