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A179781 as a simple table

na(n)
11
21
31
42
53
65
77
812
914
1027
1131
1254
1363
14119
15123
16240
17255
18490
19511
20990
211015
222015
232047
244020
254092
268127
278176
2816254
2916383
3032607
3132767
3265280
3365503
34130815
35131061
36261576
37262143
38523775
39524223
401047540
411048575
422096003
432097151
444192254

[1,1,1,2,3,5,7,12,14,27,31,54,63,119,123,240,255,
 490,511,990,1015,2015,2047,4020,4092,8127,8176,
 16254,16383,32607,32767,65280,65503,130815,131061,
 261576,262143,523775,524223,1047540,1048575,
 2096003,2097151,4192254]