# A109591 (b-file synthesized from sequence entry)
0 0
1 -3
2 2
3 3
4 56
5 -360
6 12420
7 -303030
8 10226880
9 -381416040
10 16356484800
11 -781899663600
12 41374146038400
13 -2397894225620400
14 151087293619567200
15 -10281399143079546000
16 751437976013183232000
17 -58702720576973120928000
18 4881171236699697126048000