The first, 20,  terms of the sequence of enumerating

          the number of, 3, by  n Latin rectangles (divided by n!) is

                       for n between 1 and , 20, equals

[0, 0, 2, 24, 552, 21280, 1073760, 70299264, 5792853248, 587159944704,

    71822743499520, 10435273503677440, 1776780700509416448,

    350461958856515690496, 79284041282622163140608, 20392765404792755583221760,

    5917934230798104348783083520, 1924427226324694427836833857536,

    696979289286274520909680184328192, 279603955400790511301713870268399616]

                    This took , 19.813, seconds of CPU time