# A370876 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 12 4 120 5 1320 6 17640 7 304920 8 6249600 9 143579520 10 3711052800 11 107762054400 12 3455138332800 13 120802387305600 14 4583177081683200 15 187766031131078400 16 8256125218115174400 17 387662886088250572800 18 19364540503274942976000 19 1025507260911983244595200