# A144010 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 4
4 21
5 160
6 1525
7 17760
8 243145
9 3833600
10 68373225
11 1361264000
12 29925477725
13 719991897600
14 18817847565725
15 530921477363200
16 16082605690148625
17 520603130117939200
18 17934634668874889425