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A111663 as a simple table

na(n)
01
12
24
38
416
532
662
7124
8248
9494
10988
111976
123952
137904
1415808
1531616
1663232
17126464
18252926
19505852
201011704
212023406
224046812
238093624
2416187248
2532374496
2664748992
27129497984
28258995968
29517991936
301035983870
312071967740

[1,2,4,8,16,32,62,124,248,494,988,1976,3952,7904,
 15808,31616,63232,126464,252926,505852,1011704,
 2023406,4046812,8093624,16187248,32374496,
 64748992,129497984,258995968,517991936,1035983870,
 2071967740]