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A257831 as a simple table

na(n)
00
11
210
311
4100
5101
6110
7111
81000
91001
1010
1111
12110
13111
141100
151101
161110
171111
1811000
1911001
20100
21101
221010
231011
2410100
2510101
2610110
2710111
28101000
29101001
30110
31111
321110
331111
3411100
3511101
3611110
3711111
38111000
39111001
401000
411001
4210010
4310011

[0,1,10,11,100,101,110,111,1000,1001,10,11,110,
 111,1100,1101,1110,1111,11000,11001,100,101,1010,
 1011,10100,10101,10110,10111,101000,101001,110,
 111,1110,1111,11100,11101,11110,11111,111000,
 111001,1000,1001,10010,10011]