# A153848 (b-file synthesized from sequence entry)
1 21
2 2121
3 212121
4 21212121
5 2121212121
6 212121212121
7 21212121212121
8 2121212121212121
9 212121212121212121
10 21212121212121212121
11 2121212121212121212121
12 212121212121212121212121
13 21212121212121212121212121
14 2121212121212121212121212121