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A018159 as a simple table

na(n)
01
11
23
35
49
516
627
748
884
9147
10256
11445
12776
131351
142352
154096
167131
1712416
1821618
1937640
2065536
21114104
22198668
23345901
24602248
251048576
261825676
273178688
285534417
299635980
3016777216
3129210829
3250859008

[1,1,3,5,9,16,27,48,84,147,256,445,776,1351,2352,
 4096,7131,12416,21618,37640,65536,114104,198668,
 345901,602248,1048576,1825676,3178688,5534417,
 9635980,16777216,29210829,50859008]