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A287599 as a simple table

na(n)
01
13
26
37
428
531
6120
7127
8432
9255
101632
112047
128128
13511
1432128
158191
16122624
1732767
18491008
19131071
202083840
213637247
223397632
2316777215
2416707584
2565961983
2633251328
27267124735
2866043904
291073741823
302127003648
314294967295
323350396928
3317179869183

[1,3,6,7,28,31,120,127,432,255,1632,2047,8128,511,
 32128,8191,122624,32767,491008,131071,2083840,
 3637247,3397632,16777215,16707584,65961983,
 33251328,267124735,66043904,1073741823,2127003648,
 4294967295,3350396928,17179869183]