# A121703 (b-file synthesized from sequence entry)
1 1
2 2
3 4
4 8
5 20
6 48
7 132
8 344
9 996
10 2720
11 8132
12 22888
13 69941
14 201029
15 624077
16 1821359
17 5722885
18 16919312
19 53779406
20 159276786