# A003794 (b-file synthesized from sequence entry) 0 1 1 60 2 20160 3 987033600 4 258492255436800 5 361310134959341568000 6 72736898347485916060188672000 7 78099458182389588115529148326215680000 8 447244452196213365088128369288351077766266880000