# A001180 (b-file synthesized from sequence entry)
1 1
2 1
3 2
4 3
5 3
6 5
7 9
8 16
9 28
10 50
11 89
12 159
13 285
14 510
15 914
16 1639
17 2938
18 5269
19 9451
20 16952