# A032227 (b-file synthesized from sequence entry)
1 2
2 2
3 12
4 126
5 1800
6 33900
7 782880
8 21244650
9 666080520
10 23658839400
11 939138631200
12 41199513686100
13 1979493215099400
14 103374687069173520
15 5830290120994138800
16 353179917268637208750