# A013194 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 -2
4 12
5 -40
6 120
7 208
8 -6048
9 64640
10 -428160
11 986368
12 29812992
13 -652487680
14 8332047360
15 -60911593472
16 -293043130368
17 20973645824000
18 -456591699640320
19 6185783347314688
20 -26996975653552128