# A012063 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 9
5 49
6 249
7 1963
8 14129
9 146017
10 1362961
11 17450227
12 200409465
13 3064381137
14 41812246345
15 744091967643
16 11765081428705
17 239039270010305
18 4298599985014945
19 98237724213189475
20 1980239469431883625