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1, 1, 2, 4, 12, 36, 144, 576, 2304, 9216, 46080, 230400, 1382400, 8294400, 49766400, 298598400, 2090188800, 14631321600, 117050572800, 936404582400, 7491236659200, 59929893273600, 539369039462400, 4854321355161600, 43688892196454400
(list; graph; refs; listen; history; internal format)
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