# A027912 (b-file synthesized from sequence entry)
2 1
3 5
4 28
5 156
6 880
7 5005
8 28665
9 165104
10 955434
11 5550755
12 32355917
13 189147400
14 1108476720
15 6510243495
16 38308997100
17 225810489168
18 1333057076890