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A191272 as a simple table

na(n)
00
14
217
363
4256
51025
64095
716384
865537
9262143
101048576
114194305
1216777215
1367108864
14268435457
151073741823
164294967296
1717179869185
1868719476735
19274877906944
201099511627777
214398046511103
2217592186044416
2370368744177665

[0,4,17,63,256,1025,4095,16384,65537,262143,
 1048576,4194305,16777215,67108864,268435457,
 1073741823,4294967296,17179869185,68719476735,
 274877906944,1099511627777,4398046511103,
 17592186044416,70368744177665]