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1, 3, 7, 18, 47, 124, 324, 849, 2225, 5832, 15284, 40056, 104976, 275115, 721005, 1889568, 4952069, 12978092, 34012224, 89137243, 233605663, 612220032, 1604470380, 4204901941, 11019960576, 28880466844
(list; graph; refs; listen; history; internal format)
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