# A067408 (b-file synthesized from sequence entry)
0 1
1 15
2 960
3 61440
4 3932160
5 251658240
6 16106127360
7 1030792151040
8 65970697666560
9 4222124650659840
10 270215977642229760
11 17293822569102704640
12 1106804644422573096960
13 70835497243044678205440
14 4533471823554859405148160
15 290142196707511001929482240
16 18569100589280704123486863360