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A115877 as a simple table

na(n)
00
1111
21110
311100
4111000
51110000
611100000
7111000000
81110000000
911100000000
10111000000000
11111000000111
121110000000000
131110000000111
141110000001110
1511100000000000
1611100000000111
1711100000001110

[0,111,1110,11100,111000,1110000,11100000,
 111000000,1110000000,11100000000,111000000000,
 111000000111,1110000000000,1110000000111,
 1110000001110,11100000000000,11100000000111,
 11100000001110]