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A066330 as a simple table

na(n)
00
11
210
311
4100
51000
61001
71010
81011
91100
101101
111110
121111
13-1
14-1
15-1
1610000
1710001
1810010
1910011
2010100
2111000
2211001
2311010
2411011
2511100
2611101
2711110
2811111
29-1
30-1
31-1
32100000
33100001
34100010
35100011
36100100
37101000
38101001
39101010
40101011
41101100
42101101
43101110
44101111
45-1
46-1
47-1

[0,1,10,11,100,1000,1001,1010,1011,1100,1101,1110,
 1111,-1,-1,-1,10000,10001,10010,10011,10100,11000,
 11001,11010,11011,11100,11101,11110,11111,-1,-1,
 -1,100000,100001,100010,100011,100100,101000,
 101001,101010,101011,101100,101101,101110,101111,
 -1,-1,-1]