# A366647 (b-file synthesized from sequence entry) 0 1 1 1 2 10 3 100 4 1120 5 13600 6 174352 7 2322880 8 31846720 9 446387200 10 6367988480 11 92154502912 12 1349572428800 13 19963252142080 14 297843703347200 15 4476750466785280 16 67724540010278912 17 1030392038941573120 18 15756269876770734080 19 242027462112980172800