# A012453 (b-file synthesized from sequence entry)
0 1
1 0
2 12
3 0
4 10640
5 -241920
6 75278016
7 -7539051520
8 2338162028800
9 -550757434515456
10 220140383085120512
11 -89874455859710427136
12 48809245689148176896000
13 -29578326579043904251166720