# A013161 (b-file synthesized from sequence entry) 0 0 1 2 2 -1 3 12 4 -30 5 270 6 -1215 7 12600 8 -81900 9 992250 10 -8434125 11 117879300 12 -1237732650 13 19666196550 14 -245827456875 15 4382752374000 16 -63549909423000 17 1257302087291250 18 -20745484440305625 19 451231749105637500