# A299926 (b-file synthesized from sequence entry)
1 1
2 4
3 14
4 60
5 252
6 1212
7 5880
8 30904
9 166976
10 952456
11 5587840
12 34217216
13 215204960
14 1401551376
15 9360467760
16 64384034784
17 453328282624
18 3274696185568
19 24173219998912
20 182546586425408