# A286725 (b-file synthesized from sequence entry)
0 1
1 18
2 288
3 4800
4 86400
5 1693440
6 36126720
7 836075520
8 20901888000
9 562028544000
10 16186422067200
11 497364605337600
12 16247243774361600
13 562404592189440000
14 20567939371499520000
15 792551263781781504000
16 32098326183162150912000
17 1363234794367239585792000