# A162941 (b-file synthesized from sequence entry) 0 1 1 7 2 42 3 252 4 1491 5 8820 6 52185 7 308700 8 1826160 9 10802925 10 63906150 11 378045675 12 2236381350 13 13229622000 14 78261652875 15 462967596000 16 2738748634125 17 16201445085000 18 95841881782500 19 566965863568125 20 3353964722666250