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A266838 as a simple table

na(n)
01
1100
21010
31100001
41011100
511100001011
61011100000
7111100001011111
81011100000000
91111100001011111111
101011100000000000
1111111100001011111111111
121011100000000000000
13111111100001011111111111111
141011100000000000000000
151111111100001011111111111111111

[1,100,1010,1100001,1011100,11100001011,
 1011100000,111100001011111,1011100000000,
 1111100001011111111,1011100000000000,
 11111100001011111111111,1011100000000000000,
 111111100001011111111111111,
 1011100000000000000000,
 1111111100001011111111111111111]