# A020547 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 30 4 552 5 14280 6 517680 7 25396560 8 1625662080 9 131681531520 10 13168185811200 11 1593350882323200 12 229442532323558400 13 38775788037405619200 14 7600054456464819148800 15 1710012252722891749632000 16 437763136697374129754112000