# A373759 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 0 4 1 5 15 6 180 7 2100 8 25235 9 319410 10 4299750 11 61815600 12 950524575 13 15633092475 14 274749725250 15 5151569172750 16 102831791687625 17 2179782464359500 18 48933251188321500 19 1160002995644493000 20 28956069155772383625 21 759014081927743516875