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1, 5, 15, 47, 149, 469, 1477, 4657, 14677, 46251, 145765, 459391, 1447783, 4562753, 14379751, 45318455, 142823219, 450114149, 1418555997, 4470646047, 14089451907, 44403572399, 139939952691, 441027361411, 1389918532165, 4380393813543, 13805017716305
(list; graph; refs; listen; history; internal format)
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