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A196657 as a simple table

na(n)
0127
1253
2505
31009
42017
54033
68065
716129
832257
964513
10129025
11258049
12516097
131032193
142064385
154128769
168257537
1716515073
1833030145
1966060289
20132120577
21264241153
22528482305
231056964609
242113929217
254227858433
268455716865
2716911433729
2833822867457

[127,253,505,1009,2017,4033,8065,16129,32257,
 64513,129025,258049,516097,1032193,2064385,
 4128769,8257537,16515073,33030145,66060289,
 132120577,264241153,528482305,1056964609,
 2113929217,4227858433,8455716865,16911433729,
 33822867457]