# A374659 (b-file synthesized from sequence entry)
0 1
1 4
2 24
3 168
4 1680
5 23520
6 493920
7 15805440
8 790272000
9 62431488000
10 7866367488000
11 1589006232576000
12 516427025587200000
13 270607761407692800000
14 228934166150908108800000
15 312953005128291384729600000
16 691626141333523960252416000000