# A114201 (b-file synthesized from sequence entry)
0 1
1 24
2 450
3 7700
4 126126
5 2018016
6 31855824
7 498841200
8 7773608700
9 120784604512
10 1873533922260
11 29034766346040
12 449790717967500
13 6967723880880000
14 107959904588606400
15 1673378521123399200
16 25949671331244477300
17 402629171550425820000
18 6250759024406391495000