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1, -20, 220, -1760, 11420, -63624, 315040, -1418560, 5903260, -22976820, 84413912, -294841120, 984745120, -3159938760, 9780562880, -29296914112, 85169213340, -240882506920, 664216884540, -1788966694240, 4714033526616
(list; graph; refs; listen; history; internal format)
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