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1, 1, 3, 6, 13, 30, 76, 211, 638, 2088, 7354, 27731, 111449, 475449, 2145316, 10205714, 51038980, 267623147, 1467786895, 8401550878, 50087295107, 310419697655, 1996491898802, 13303966566481, 91714857551787
(list; graph; refs; listen; history; internal format)
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