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A287857 as a simple table

na(n)
01
11
2110
3111
410100
511111
61001000
71111111
8101110000
9100111111
1011110100000
1111011111111
121101001000000
13101111111111
14110111110000000
15111000111111111
1611011110100000000
1711100011111111111
181101111001000000000
191100001111111111111

[1,1,110,111,10100,11111,1001000,1111111,
 101110000,100111111,11110100000,11011111111,
 1101001000000,101111111111,110111110000000,
 111000111111111,11011110100000000,
 11100011111111111,1101111001000000000,
 1100001111111111111]