# A333983 (b-file synthesized from sequence entry) 0 0 1 1 2 6 3 64 4 1328 5 46336 6 2423040 7 177379840 8 17314109440 9 2172895068160 10 340868882825216 11 65356107645583360 12 15037174515952517120 13 4088810357694136320000 14 1297103066111891262668800 15 474788193071044243776077824 16 198617395218460028950533898240 17 94165608216423156721014443868160