# A306496 (b-file synthesized from sequence entry)
1 0
2 0
3 1
4 6
5 156
6 4800
7 208440
8 11939760
9 874681920
10 79795860480
11 8873760470400
12 1181869427692800
13 185755937440550400
14 34022680848982425600
15 7183771725162237004800
16 1732270657442505852672000
17 473131604733608510097408000
18 145308345869661566419795968000