# A114450 (b-file synthesized from sequence entry) 0 0 1 1 2 10 3 252 4 12176 5 966240 6 114341760 7 18897709824 8 4160840140800 9 1177736213606400 10 416807049369600000 11 180368555623280640000 12 93711488655948742656000 13 57572391079539343687680000