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1, 1, 3, 6, 11, 21, 38, 70, 130, 239, 441, 810, 1490, 2740, 5037, 9261, 17025, 31300, 57542, 105787, 194481, 357537, 657301, 1208394, 2221532, 4084101, 7508277, 13803340, 25376285, 46652176, 85766121
(list; graph; refs; listen; history; internal format)
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