# A052583 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 6
4 24
5 240
6 2160
7 25200
8 322560
9 4717440
10 76204800
11 1357171200
12 26345088000
13 554204851200
14 12553673932800
15 304688127744000
16 7887891787776000
17 216969331138560000
18 6319142847553536000