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1, 2, 5, 12, 27, 64, 141, 330, 721, 1674, 3641, 8410, 18241, 41986, 90897, 208708, 451255, 1034292, 2234205, 5114220, 11039871, 25246376, 54470817, 124474648, 268460375, 613133340, 1321990349, 3017984992, 6505697947
(list; graph; refs; listen; history; internal format)
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