# A375627 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 24
4 168
5 1260
6 11760
7 126000
8 1545600
9 21304080
10 326350080
11 5497873920
12 101048048640
13 2011924474560
14 43139969832960
15 991088998099200
16 24286975237324800
17 632358338278867200
18 17433184834127462400
19 507307459608530380800
20 15539683835941532467200