# A006787 (b-file synthesized from sequence entry)
1 1
2 2
3 3
4 6
5 11
6 23
7 48
8 114
9 293
10 869
11 2963
12 12066
13 58933
14 347498
15 2455693
16 20592932
17 202724920
18 2322206466
19 30743624324
20 468026657815
21 8161170076257