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A287739 as a simple table

na(n)
01
111
2100
3111
410000
511111
61100000
7111111
8110000000
911111111
1011000000000
111111111111
121100000000000
13111111111111
14111100000000000
15111111111111
1611110000000000000
1711111111111111
181111000000000000000
191111111111111111
20111100000000000000000

[1,11,100,111,10000,11111,1100000,111111,
 110000000,11111111,11000000000,1111111111,
 1100000000000,111111111111,111100000000000,
 111111111111,11110000000000000,11111111111111,
 1111000000000000000,1111111111111111,
 111100000000000000000]