# A006786 (b-file synthesized from sequence entry)
1 1
2 2
3 4
4 8
5 18
6 44
7 117
8 351
9 1230
10 5069
11 25181
12 152045
13 1116403
14 9899865
15 104980369
16 1318017549
17 19427531763
18 333964672216
19 6660282066936