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0, 8, 60, 368, 2100, 11528, 61740, 325088, 1690980, 8717048, 44633820, 227363408, 1153594260, 5835080168, 29443836300, 148292923328, 745759583940, 3745977788888, 18798608421180, 94267920012848, 472439111692020, 2366593604971208
(list; graph; refs; listen; history; internal format)
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