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A130740 as a simple table

na(n)
07
121
265541
318446744073709551621
4115792089237316195423570985008687907853269984665640564039457584007913129639941

[7,21,65541,18446744073709551621,
 11579208923731619542357098500868790785326998466564\
 0564039457584007913129639941]