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A115812 as a simple table

na(n)
11111
211110
3111100
41111000
511110000
6111100000
71111000000
811110000000
9111100000000
10111100001111
111111000000000
121111000001111
131111000011110
141111000011111
151111100001111
1611110000000000
1711110000001111

[1111,11110,111100,1111000,11110000,111100000,
 1111000000,11110000000,111100000000,111100001111,
 1111000000000,1111000001111,1111000011110,
 1111000011111,1111100001111,11110000000000,
 11110000001111]