The first, 20, terms of the sequence of enumerating the number of, 2, by n Latin rectangles (divided by n!) is for n between 1 and , 20, equals [0, 1, 2, 9, 44, 265, 1854, 14833, 133496, 1334961, 14684570, 176214841, 2290792932, 32071101049, 481066515734, 7697064251745, 130850092279664, 2355301661033953, 44750731559645106, 895014631192902121] This took , 0.048, seconds of CPU time