5259150

Appears in sequences

• 9th column of Catalan triangle A009766.at n=15A124087
• Central terms of the triangle in A208101.at n=15A208983
• a(n) = A128899(2*n, n) = 2*binomial(4*n - 1, 3*n) for n >= 1 and a(0) = 1.at n=8A359108