# A174570 (b-file synthesized from sequence entry)
1 1
2 2
3 10
4 11
5 22
6 1000
7 1001
8 1010
9 1011
10 1100
11 1101
12 1110
13 1111
14 2222
15 10002
16 10012
17 10020
18 10021
19 10102
20 10112
21 10120
22 10121
23 10200
24 10201
25 10210
26 10211
27 11002
28 11012
29 11020
30 11021
31 11102
32 11112
33 11120
34 11121
35 11200
36 11201
37 11210
38 11211
39 12000
40 12001
41 12010
42 12011
43 12100
44 12101
45 12110
46 12111
47 20000
48 20001
49 20010