# A072477 (b-file synthesized from sequence entry)
2 18
3 1800
4 352800
5 114307200
6 55324684800
7 37399486924800
8 33659538232320000
9 38910426196561920000
10 56186655427835412480000
11 99113260174701667614720000
12 209723658529668728672747520000
13 524309146324171821681868800000000