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A045683 as a simple table

na(n)
01
11
21
31
42
53
63
77
88
914
1015
1131
1230
1363
1463
15123
16128
17255
18252
19511
20510
211015
221023
232047
242040
254092
264095
278176
288190
2916383
3016365
3132767
3232768
3365503
3465535
35131061
36131040
37262143
38262143
39524223
40524280
411048575
421048509
432097151

[1,1,1,1,2,3,3,7,8,14,15,31,30,63,63,123,128,255,
 252,511,510,1015,1023,2047,2040,4092,4095,8176,
 8190,16383,16365,32767,32768,65503,65535,131061,
 131040,262143,262143,524223,524280,1048575,
 1048509,2097151]