# A037697 (b-file synthesized from sequence entry)
1 1
2 8
3 51
4 306
5 1837
6 11024
7 66147
8 396882
9 2381293
10 14287760
11 85726563
12 514359378
13 3086156269
14 18516937616
15 111101625699
16 666609754194
17 3999658525165
18 23997951150992
19 143987706905955
20 863926241435730
21 5183557448614381