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A056508 as a simple table

na(n)
10
21
31
43
53
66
77
813
915
1025
1131
1250
1363
1499
15127
16197
17255
18391
19511
20777
211023
221551
232047
243090
254095
266175
278191
2812323
2916383
3024639
3132767
3249221
3365535
3498431
35131071
36196743
37262143
38393471
39524287
40786697
411048575
421573375
432097151
443146255
454194303

[0,1,1,3,3,6,7,13,15,25,31,50,63,99,127,197,255,
 391,511,777,1023,1551,2047,3090,4095,6175,8191,
 12323,16383,24639,32767,49221,65535,98431,131071,
 196743,262143,393471,524287,786697,1048575,
 1573375,2097151,3146255,4194303]