# A012357 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 -3
4 16
5 -50
6 80
7 924
8 -24544
9 320832
10 -4041152
11 44762960
12 -443911360
13 3134031264
14 10007901696
15 -1090110964320
16 32403860361216
17 -748994799421952
18 15182814672728064
19 -270877746698076672
20 3931180447615393792
21 -28568579846042019840
22 -934246098808782868480