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A113999 as a simple table

na(n)
11
211
3101
41011
510001
6100111
71000001
810001011
9100000101
101000010011
1110000000001
12100000101111
131000000000001
1410000001000011
15100000000010101
161000000010001011
1710000000000000001
18100000000100100111

[1,11,101,1011,10001,100111,1000001,10001011,
 100000101,1000010011,10000000001,100000101111,
 1000000000001,10000001000011,100000000010101,
 1000000010001011,10000000000000001,
 100000000100100111]