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A224840 as a simple table

na(n)
11
23
36
414
527
661
7117
8250
9494
101012
112007
124088
138112
1416357
1532635
1665493
17130779
18262115
19523710
201048502
212096110
224194124
238386419
2416777182
2533550085
2667108507
27134209495
28268434899
29536853987
301073741664
312147449815
324294966187
338589868975
3417179866799

[1,3,6,14,27,61,117,250,494,1012,2007,4088,8112,
 16357,32635,65493,130779,262115,523710,1048502,
 2096110,4194124,8386419,16777182,33550085,
 67108507,134209495,268434899,536853987,1073741664,
 2147449815,4294966187,8589868975,17179866799]