# A221160 (b-file synthesized from sequence entry) 0 1 1 5 2 56 3 864 4 16896 5 399360 6 11059200 7 350945280 8 12551454720 9 499415777280 10 21879167385600 11 1046394961920000 12 54245114825932800 13 3029690116944691200 14 181363518724689100800 15 11583863454028529664000 16 786298610212845649920000 17 56523637237014847291392000