98156060225
domain: N
Appears in sequences
- Expansion of c(8*x^2)/(1 - x*c(8*x^2)), where c(x) is the g.f. of A000108.at n=17A132375
- 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=9A194721
- Number of 9-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=9A194729
- 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=9A248828