163719

Appears in sequences

• Number of walks of length 2n on the 3-regular tree beginning and ending at some fixed vertex.at n=7A089022
• Expansion of c(2*x^2)/(1-x*c(2*x^2)), where c(x) = (1-sqrt(1-4*x))/(2*x) is the g.f. of the Catalan numbers (A000108).at n=14A126087
• Square array A(n,k) by antidiagonals. A(n,k) is the number of length 2n k-ary words (n,k>=0) that can be built by repeatedly inserting doublets into the initially empty word.at n=62A183135