# A176473 (b-file synthesized from sequence entry)
1 0
2 1
3 2
4 5
5 24
6 121
7 600
8 5039
9 40320
10 302401
11 3659040
12 39916799
13 399168000
14 6227020801
15 87160993920
16 1100625926399
17 20922789888000
18 355687428096001
19 5335329064665600
20 121645100408831999
21 2453176191578112000