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6, 30, 78, 246, 582, 1830, 4758, 14358, 41118, 122430, 360438, 1079742, 3213222, 9624990, 28798926, 86319894, 258673542, 775718310, 2326095798, 6976966422, 20927018814, 62775429150, 188311523478, 564911643486, 1694677889958
(list; graph; refs; listen; history; internal format)
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