# A075166 (b-file synthesized from sequence entry)
1 0
2 10
3 1010
4 1100
5 101010
6 101100
7 10101010
8 110100
9 110010
10 10101100
11 1010101010
12 10110100
13 101010101010
14 1010101100
15 10110010
16 111000
17 10101010101010
18 11001100
19 1010101010101010
20 1010110100
21 1010110010