# A213641 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 33
4 408
5 6760
6 140880
7 3543120
8 104469120
9 3535037856
10 135053291520
11 5750579640960
12 270067321117440
13 13868724577593600
14 773138898730598400
15 46500352460941579200
16 3001412657729335449600
17 206946807350480534937600
18 15180752044039172426035200