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A132198 as a simple table

na(n)
02
15
217
3257
465537
54294967311
618446744073709551629
7340282366920938463463374607431768211507
8115792089237316195423570985008687907853269984665640564039457584007913129640233

[2,5,17,257,65537,4294967311,18446744073709551629,
 340282366920938463463374607431768211507,
 11579208923731619542357098500868790785326998466564\
 0564039457584007913129640233]