# A012161 (b-file synthesized from sequence entry)
0 1
1 2
2 24
3 720
4 48000
5 4896000
6 804480000
7 175037491200
8 53010886656000
9 19962353688576000
10 9637819435745280000
11 5576675932580413440000
12 3929711821948633743360000
13 3235566861687414718464000000