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1, 2, 6, 14, 34, 81, 196, 472, 1139, 2744, 6613, 15939, 38416, 92588, 223150, 537824, 1296232, 3124104, 7529536, 18147253, 43737461, 105413504, 254061541, 612324458, 1475789056, 3556861577, 8572542414
(list; graph; refs; listen; history; internal format)
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