# A078700 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 30
5 192
6 1560
7 15120
8 171360
9 2217600
10 32296320
11 522547200
12 9300614400
13 180583603200
14 3798482688000
15 86044973414400
16 2088355965696000
17 54064489070592000
18 1487129136869376000
19 43312058119249920000