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1, -28, 420, -4480, 38052, -273336, 1723008, -9770240, 50722980, -244273820, 1102294984, -4698110592, 19034512000, -73696070840, 273868321536, -980502270720, 3392689809572, -11376760267320, 37060195850020
(list; graph; refs; listen; history; internal format)
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