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1, 1, 2, 3, 7, 14, 25, 46, 97, 189, 344, 674, 1383, 2683, 4950, 9955, 20175, 39130, 72905, 148487, 298925, 580328, 1089343, 2233409, 4478413, 8705686, 16438345, 33822205, 67650909, 131688362, 251448212, 515037942, 1028483089
(list; graph; refs; listen; history; internal format)
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