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1, 5, 30, 174, 1102, 8004, 64908, 631296, 7632144, 85538304, 767957760, 10378782720, 141810600960, 2211872624640, 34073996544000, 592443113472000, 9995136528384000, 193299238895616000, 3978509063587430400
(list; graph; refs; listen; history; internal format)
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