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A006943 as a simple table

na(n)
01
111
2101
31111
410001
5110011
61010101
711111111
8100000001
91100000011
1010100000101
11111100001111
121000100010001
1311001100110011
14101010101010101
151111111111111111
1610000000000000001
17110000000000000011

[1,11,101,1111,10001,110011,1010101,11111111,
 100000001,1100000011,10100000101,111100001111,
 1000100010001,11001100110011,101010101010101,
 1111111111111111,10000000000000001,
 110000000000000011]