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A053369
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Linear recursion with Catalan numbers.
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0
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2, 9, 32, 115, 420, 1554, 5808, 21879, 82940, 316030, 1209312, 4644094, 17889032, 69089700, 267444000, 1037348415, 4030774380, 15687019590, 61137753600, 238580530650, 932105099640
(list; graph; refs; listen; history; internal format)
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