# A077460 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 12
5 70
6 464
7 3482
8 27779
9 233556
10 2038484
11 18357672
12 169599492
13 1601270562
14 15401735750
15 150547249932
16 1492451793728
17 14980801247673
18 152047178479946
19 1558569469867824
20 16119428039548246