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"Closed" form for Motzkin and related numbersI wonder whether it is impossible to write the nth Motzkin number as a sum of a fixed number of, say, hypergeometric terms. To illustrate what I mean: $n!+(2n)!$ is not a hypergeometric term, but it is written as a sum of two hypergeometric terms. I'd also appreciate other examples, especially if they come from counting weighted Motzkin paths.
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