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A071998 as a simple table

na(n)
00
11
21010
31011
41100100
51100101
61101110
71101111
81111101000
91111101001
101111110010
111111110011
1210001001100
1310001001101
1410001010110
1510001010111
1610011100010000
1710011100010001
1810011100011010
1910011100011011

[0,1,1010,1011,1100100,1100101,1101110,1101111,
 1111101000,1111101001,1111110010,1111110011,
 10001001100,10001001101,10001010110,10001010111,
 10011100010000,10011100010001,10011100011010,
 10011100011011]