Information on Motzkin Words, Paths, Trees

For n = 1,2,3,...,15, there are 1, 1, 2, 4, 9, 21, 51, 127, 323, 835, 2188, 5798, 15511, 41835, 113634 of them, respectively. This is sequence A001006(M1184) in Neil J. Sloane's database of integer sequences.

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