# A078973 (b-file synthesized from sequence entry) 1 2 2 6 3 36 4 420 5 9800 6 452760 7 41835024 8 7691667984 9 2828336198688 10 2073619375892064 11 3040584296923128384 12 8898500292240756664896 13 52084270468105185237918848 14 608812309050346291991694422400