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A281309 as a simple table

na(n)
01
111
21
3111
410001
5110111
610001
71110111
8101000001
91011000111
1010001010001
11110110110111
121
13111
1410001
151110111
16101000001
1711011000111
181000001010001
19111000110110111
2010101010000000001
211111011110000000111
22100000001010000010001

[1,11,1,111,10001,110111,10001,1110111,101000001,
 1011000111,10001010001,110110110111,1,111,10001,
 1110111,101000001,11011000111,1000001010001,
 111000110110111,10101010000000001,
 1111011110000000111,100000001010000010001]