# A075510 (b-file synthesized from sequence entry) 0 1 1 30 2 560 3 8400 4 111216 5 1360800 6 15790720 7 176563200 8 1922176256 9 20518417920 10 215825326080 11 2244998246400 12 23153670762496 13 237224718704640 14 2418102840688640 15 24549985173504000 16 248464183682727936