# A027493 (b-file synthesized from sequence entry)
2 1
3 120
4 36935
5 25816200
6 36133755364
7 91850446178400
8 393327895035809180
9 2675039498159452367040
10 27560317167934730312259456
11 413843767423449662598795745920
12 8770587574512577781320579427273280