# A047677 (b-file synthesized from sequence entry)
0 2
1 4
2 24
3 288
4 5760
5 172800
6 7257600
7 406425600
8 29262643200
9 2633637888000
10 289700167680000
11 38240422133760000
12 5965505852866560000
13 1085722065221713920000
14 228001633696559923200000
15 54720392087174381568000000
16 14883946647711431786496000000