# A374986 (b-file synthesized from sequence entry)
0 1
1 6
2 36
3 252
4 2016
5 20160
6 262080
7 4717440
8 122653440
9 4783484160
10 287009049600
11 26978850662400
12 4019848748697600
13 956724002190028800
14 365468568836591001600
15 224763169834503465984000
16 222965064475827438256128000
17 357190033290275556086317056000