25066621

Appears in sequences

• Expansion of c(6*x^2)/(1-x*c(6*x^2)), where c(x) is the g.f. of A000108.at n=13A132373
• Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting seven doublets into the initially empty word.at n=7A194719
• Number of 7-ary 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=7A194727
• Number of 2n-length words, either empty or beginning with the first character of an n-ary alphabet, that can be built by repeatedly inserting doublets into the initially empty word.at n=7A248828