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A005015 as a simple table

na(n)
011
122
244
388
4176
5352
6704
71408
82816
95632
1011264
1122528
1245056
1390112
14180224
15360448
16720896
171441792
182883584
195767168
2011534336
2123068672
2246137344
2392274688
24184549376
25369098752
26738197504
271476395008
282952790016
295905580032
3011811160064

[11,22,44,88,176,352,704,1408,2816,5632,11264,
 22528,45056,90112,180224,360448,720896,1441792,
 2883584,5767168,11534336,23068672,46137344,
 92274688,184549376,369098752,738197504,1476395008,
 2952790016,5905580032,11811160064]