# A012615 (b-file synthesized from sequence entry) 0 1 1 0 2 -12 3 -120 4 -5040 5 -35520 6 -10080576 7 1291774848 8 -129155669760 9 70025050601472 10 -12621771155397632 11 7717419122045659136 12 -2918362206037173678080 13 1928021073359516653240320 14 -1209535003923466323711246336 15 977832736949625091059703971840