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A070592 as a simple table

na(n)
03
15
217
3257
465537
56700417
667280421310721
75704689200685129054721
893461639715357977769163558199606896584051237541638188580280321

[3,5,17,257,65537,6700417,67280421310721,
 5704689200685129054721,
 93461639715357977769163558199606896584051237541638\
 188580280321]