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A172320 as a simple table

na(n)
01
12
24
38
416
532
664
7128
8256
9512
101024
112047
124092
138180
1416352
1532688
1665344
17130624
18261120
19521984
201043456
212085888
224169729
238335366
2416662552
2533308752
2666584816
27133104288
28266077952
29531894784
301063267584

[1,2,4,8,16,32,64,128,256,512,1024,2047,4092,8180,
 16352,32688,65344,130624,261120,521984,1043456,
 2085888,4169729,8335366,16662552,33308752,
 66584816,133104288,266077952,531894784,1063267584]