For base 2 the double-trouble number is
0 1
For base 3 the double-trouble number is
0 1 2 1
For base 4 the double-trouble number is
0 2 1
For base 5 the double-trouble number is
1 3
For base 6 the double-trouble number is
0 3 1 3 4 5 2 4 2 1
For base 7 the double-trouble number is
0 3 5 2 4 5 6 3 1 4 2 1
For base 8 the double-trouble number is
2 5
For base 9 the double-trouble number is
0 4 6 7 8 4 2 1
For base 10 the double-trouble number is
0 5 2 6 3 1 5 7 8 9 4 7 3 6 8 4 2 1
For base 11 the double-trouble number is
3 7
For base 12 the double-trouble number is
0 6 3 1 6 9 4 8 4 2 1
For base 13 the double-trouble number is
2 7 10 5
For base 14 the double-trouble number is
4 9
For base 15 the double-trouble number is
0 7 11 5 10 5 2 8 11 13 6 10 12 13 14 7 3 9 4 9 12 6 3 1 8 4 2 1
For base 16 the double-trouble number is
0 8 4 2 1
For base 17 the double-trouble number is
5 11
For base 18 the double-trouble number is
2 10 5
For base 19 the double-trouble number is
0 9 14 7 3 11 5 12 6 3 1 10 5 2 10 14 16 17 18 9 4 11 15 7 13 6 12 15 17 8 13 16 8 4 2 1
For base 20 the double-trouble number is
6 13
For base 35 the double-trouble number is
11 23
For base 50 the double-trouble number is
16 33
For base 100 the double-trouble number is
0 50 25 12 56 28 14 7 3 51 75 87 93 96 98 49 24 62 31 15 57 78 89 44 72 36 18 9 4 52 26 13 6 53 26 63 31 65 82 91 45 72 86 43 21 60 80 40 20 10 5 2 51 25 62 81 40 70 35 17 58 79 39 69 84 92 46 23 11 55 77 88 94 47 23 61 80 90 45 22 61 30 65 32 66 33 16 58 29 14 57 28 64 32 16 8 4 2 1
For base 150 the double-trouble number is
6 78 39 19 84 117 58 104 52 26 13
For base 199 the double-trouble number is
0 99 149 74 136 167 183 91 145 72 135 167 83 141 70 134 166 182 190 194 196 197 198 99 49 124 62 31 15 107 53 126 63 31 115 57 128 64 32 16 8 4 2 1