# A329965 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 72 4 240 5 7200 6 25200 7 1411200 8 5080320 9 457228800 10 1676505600 11 221298739200 12 821966745600 13 149597947699200 14 560992303872000 15 134638152929280000 16 508633022177280000 17 155641704786247680000 18 591438478187741184000 19 224746621711341649920000