# A003787 (b-file synthesized from sequence entry) 0 1 1 24 2 5616 3 12130560 4 237783237120 5 42064805779476480 6 67034222101339041669120 7 961721214905722855895197286400 8 124190524600592082795473760093457612800 9 144339416867688029764487130056208182629053235200