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1, 4, 14, 44, 126, 338, 870, 2178, 5338, 12854, 30486, 71346, 165004, 377616, 856226, 1925952, 4302602, 9556668, 21123352, 46495132, 101966972, 222873154, 485600018, 1054774296, 2284128920, 4931542640, 10616417010, 22790442500, 48794077242, 104205354276
(list; graph; refs; listen; history; internal format)
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