52955950

Appears in sequences

• Expansion of c(3*x^2)/(1-x*c(3*x^2)), c(x) the g.f. of A000108.at n=17A128386
• Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting nine doublets into the initially empty word.at n=4A194721
• Number of quaternary words either empty or beginning with the first character of the alphabet, that can be built by inserting n doublets into the initially empty word.at n=9A194724