# A013191 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 -3
4 12
5 -15
6 -120
7 1197
8 -6048
9 -255
10 428160
11 -5448003
12 29812992
13 241437105
14 -8332047360
15 104019879597
16 -293043130368
17 -17849464279935
18 456591699640320
19 -5108933510880003
20 -26996975653552128