# A052728 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 12 4 168 5 2880 6 64080 7 1723680 8 54633600 9 1992936960 10 82261267200 11 3790579161600 12 192895381324800 13 10744251136819200 14 650181362358528000 15 42476922345521664000 16 2979716339168464896000 17 223385082959833546752000