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A281040 as a simple table

na(n)
01
10
2100
311
410100
510011
61000000
7111111
8101110000
9111101111
1011110100000
111011011111
121011001000000
131100000111111
14110011100000000
15110011111111
1611100100100000000
171011111111
181111111001000000000
19111000000111111111
20100100111100000000000

[1,0,100,11,10100,10011,1000000,111111,101110000,
 111101111,11110100000,1011011111,1011001000000,
 1100000111111,110011100000000,110011111111,
 11100100100000000,1011111111,1111111001000000000,
 111000000111111111,100100111100000000000]