# A052623 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 18
4 192
5 2520
6 39600
7 725760
8 15200640
9 358162560
10 9376819200
11 270037152000
12 8483597337600
13 288734500454400
14 10582834303641600
15 415593298568448000
16 17408598098411520000
17 774797125808369664000