# A189566 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 24
5 60
6 208
7 1184
8 7840
9 51636
10 410272
11 3836456
12 39971896
13 455888312
14 5717233896
15 78164908748
16 1153568477544
17 18263732340736
18 308795344195456
19 5550690255143992
20 105653899427070440
21 2122307518838927952