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A005489 as a simple table

na(n)
11
21
32
41
58
67
732
831
996
1097
11512
12511
132048
142047
157396
167531
1732768
1832767
19131072
20131071
21508436
22512245
232097152
242097151
258202208
268207797
2733256980
2833335611
29134217728
30134217727
31536870912
32536870911
332142108916
342143603741
358589928768
368589921949

[1,1,2,1,8,7,32,31,96,97,512,511,2048,2047,7396,
 7531,32768,32767,131072,131071,508436,512245,
 2097152,2097151,8202208,8207797,33256980,33335611,
 134217728,134217727,536870912,536870911,
 2142108916,2143603741,8589928768,8589921949]