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 Anum=A001006"> A001006(M1184) in


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