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A286140 as a simple table

na(n)
01
11
2110
311
411100
510111
61011000
71001111
8101110000
9111011111
1010001100000
1111100111111
121011111000000
131001101111111
14101100110000000
15100110011111111
1610111111100000000
1710000110111111111
181011110011000000000
191001111001111111111

[1,1,110,11,11100,10111,1011000,1001111,101110000,
 111011111,10001100000,11100111111,1011111000000,
 1001101111111,101100110000000,100110011111111,
 10111111100000000,10000110111111111,
 1011110011000000000,1001111001111111111]