# A102355 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 120
4 121
5 201
6 2120
7 12120
8 121201
9 212012
10 12012120
11 12120121
12 20121201
13 212012120
14 1212012120
15 12120121201
16 21201212012
17 1201212012120
18 1212012120121
19 2012120121201
20 21201212012120
21 121201212012120