# A152885 (b-file synthesized from sequence entry)
1 0
2 0
3 2
4 6
5 72
6 360
7 4320
8 30240
9 403200
10 3628800
11 54432000
12 598752000
13 10059033600
14 130767436800
15 2440992153600
16 36614882304000
17 753220435968000
18 12804747411456000
19 288106816757760000
20 5474029518397440000
21 133809610449715200000
22 2810001819444019200000