# A365282 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 12 4 96 5 900 6 10800 7 157080 8 2634240 9 50455440 10 1089849600 11 26157479040 12 690848040960 13 19924295751360 14 623024501299200 15 20996216063222400 16 758724126031872000 17 29267547577396128000 18 1200407895406514995200