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A281039 as a simple table

na(n)
01
10
21
31100
4101
5110010
61
711111100
811101
91111011110
10101111
11111110110100
121001101
1311111100000110
141110011
151111111100110000
16100100111
17111111110100000000
181001111111
1911111111100000011100
201111001001
211111111111101101000000
22110011011111

[1,0,1,1100,101,110010,1,11111100,11101,
 1111011110,101111,111110110100,1001101,
 11111100000110,1110011,1111111100110000,100100111,
 111111110100000000,1001111111,
 11111111100000011100,1111001001,
 1111111111101101000000,110011011111]