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A177105 as a simple table

na(n)
153
2127
3431
41999
58191
618521
727647
831249
959581
1078607
11159013
12194671
13314927
14332749
15390223
16453961
17524287
18657017
191062881
201457999
211507141
221608713
231940597
242519423
253455999
264000751
274393999
285371237
295606441

[53,127,431,1999,8191,18521,27647,31249,59581,
 78607,159013,194671,314927,332749,390223,453961,
 524287,657017,1062881,1457999,1507141,1608713,
 1940597,2519423,3455999,4000751,4393999,5371237,
 5606441]