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A247620 as a simple table

na(n)
01
17
225
367
4157
5343
6721
71483
83013
96079
1012217
1124499
1249069
1398215
14196513
15393115
16786325
171572751
183145609
196291331
2012582781
2125165687
2250331505
23100663147
24201326437
25402653023
26805306201
271610612563
283221225293
296442450759
3012884901697

[1,7,25,67,157,343,721,1483,3013,6079,12217,24499,
 49069,98215,196513,393115,786325,1572751,3145609,
 6291331,12582781,25165687,50331505,100663147,
 201326437,402653023,805306201,1610612563,
 3221225293,6442450759,12884901697]