# A052742 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 12
4 144
5 2640
6 64800
7 1985760
8 72817920
9 3105527040
10 150907276800
11 8226772646400
12 497068582348800
13 32962398345676800
14 2379770152465305600
15 185792734381782528000
16 15595576381312671744000
17 1400555897449216155648000
18 133983477830143785811968000
19 13602115002476999012990976000