# A077551 (b-file synthesized from sequence entry)
0 0
1 1
2 3
3 5
4 16
5 31
6 105
7 218
8 770
9 1673
10 6096
11 13672
12 51027
13 117194
14 445787
15 1042970
16 4028922
17 9567393
18 37432324
19 89984282
20 355854272