# A372986 (b-file synthesized from sequence entry) 0 1 1 2 2 12 3 60 4 672 5 5400 6 88704 7 982800 8 21288960 9 300736800 10 8089804800 11 138940401600 12 4465572249600 13 90311261040000 14 3375972620697600 15 78570797104800000 16 3348964839732019200 17 88156434351585600000 18 4219695698062344192000 19 123947946698329353600000