# A107762 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 24
5 60
6 432
7 3360
8 6912
9 86400
10 1080000
11 3432000
12 57542400
13 601810560
14 3374784000
15 71391196800
16 1506917744640
17 8134703216640
18 87731370397440
19 2330058011258880
20 15991083879321600
21 484342868413071360