# A365285 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 48
5 480
6 5040
7 57960
8 806400
9 13426560
10 250992000
11 5102697600
12 113283878400
13 2760905347200
14 73287883468800
15 2093750122464000
16 63947194517606400
17 2082970788291993600
18 72182922107859763200
19 2651026034089585152000