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A219615 as a simple table

na(n)
01
12
24
38
416
532
664
7128
8256
9512
101024
112048
124096
138191
1416369
1532647
1664839
17127858
18249528
19480492
20910596
211695222
223096514
235546382
249740686
2516777216
2628354132
2747050564
2876717268
29123012781
30194129627
31301766029
32462411533
33699030226
341043243132

[1,2,4,8,16,32,64,128,256,512,1024,2048,4096,8191,
 16369,32647,64839,127858,249528,480492,910596,
 1695222,3096514,5546382,9740686,16777216,28354132,
 47050564,76717268,123012781,194129627,301766029,
 462411533,699030226,1043243132]