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1, 1, 2, 4, 7, 16, 27, 65, 108, 267, 440, 1105, 1812, 4597, 7514, 19196, 31307, 80380, 130883, 337284, 548547, 1417582, 2303413, 5965622, 9686617, 25130844, 40783083, 105954110, 171868037, 447015744, 724837891, 1886996681
(list; graph; refs; listen; history; internal format)
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