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A354765 as a simple table

na(n)
10
20
31
43
56
67
713
815
927
1059
11122
12123
13243
14499
15501
16511
171007
182031
194047
208143
2116271
2232655
2365422
2465423
25130831
26261903
27523791
281048079
292096651
302096671
314193813
324193815
334193311
348387615
3516775199
3633552415
3767104799
38134213663
39268427295
40536862751
411073725471
422147467295
434294934559
448589901855
4517179803679

[0,0,1,3,6,7,13,15,27,59,122,123,243,499,501,511,
 1007,2031,4047,8143,16271,32655,65422,65423,
 130831,261903,523791,1048079,2096651,2096671,
 4193813,4193815,4193311,8387615,16775199,33552415,
 67104799,134213663,268427295,536862751,1073725471,
 2147467295,4294934559,8589901855,17179803679]