# A374982 (b-file synthesized from sequence entry) 0 1 1 4 2 16 3 80 4 480 5 3840 6 42240 7 675840 8 16220160 9 600145920 10 34808463360 11 3202378629120 12 470749658480640 13 111096919401431040 14 42216829372543795200 15 25878916405369346457600 16 25620127241315652993024000 17 40992203586105044788838400000