# A052587 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 6
4 48
5 480
6 5760
7 80640
8 1290240
9 23224320
10 464486400
11 10218700800
12 245248819200
13 6376469299200
14 178541140377600
15 5356234211328000
16 171399494762496000
17 5827582821924864000
18 209792981589295104000