# A193935 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 24
5 120
6 720
7 5034
8 40087
9 356942
10 3500551
11 37343168
12 428886219
13 5257753614
14 68306562647
15 934747457369
16 13404687958473
17 200554264435218
18 3118638648191005
19 50236367074036768
20 835860362285064716