# A137704 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 8
5 96
6 3456
7 497664
8 286654464
9 825564856320
10 11888133931008000
11 1027134771639091200000
12 532466665617704878080000000
13 1932215036193527461576704000000000