# A124534 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 25
4 113
5 608
6 3535
7 21844
8 141809
9 959882
10 6738850
11 48877221
12 365145267
13 2803002587
14 22066904802
15 177881536038
16 1466278969213
17 12345543329079
18 106069531868783
19 929158597546721
20 8292429187449462
21 75348425058995464