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A225237 as a simple table

na(n)
10
21
310
411
5100
6101
7110
8111
91000
101001
111100
121101
131111
1410000
1510001
1610011
1710100
1810101
1910111
2011000
2111001
2211100
2311101
24100000
25100001
26101000
27101010
28101100
29101101
30101111
31110000
32110001
33110101
34110110
35111011
36111100
37111101
381000000

[0,1,10,11,100,101,110,111,1000,1001,1100,1101,
 1111,10000,10001,10011,10100,10101,10111,11000,
 11001,11100,11101,100000,100001,101000,101010,
 101100,101101,101111,110000,110001,110101,110110,
 111011,111100,111101,1000000]