# A024265 (b-file synthesized from sequence entry)
0 0
1 1
2 4
3 168
4 7808
5 725120
6 92516352
7 16783492096
8 3985986666496
9 1212492098764800
10 457766291434373120
11 210284967226818953216
12 115422873756041723510784
13 74614491201111668354449408