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1, 2, 10, 54, 324, 2130, 15102, 114282, 915016, 7701570, 67785410, 621241302, 5907779100, 58122866490, 590120962494, 6169755680850, 66300171884560, 731081377197218, 8260198332989274, 95504954267579062
(list; graph; refs; listen; history; internal format)
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