27233

Appears in sequences

• Riordan array (1/(1-4*x*c(x)),xc(x)), c(x) the g.f. of A000108.at n=38A117380
• Expansion of g.f. x^2*(1+4*x-3*x^2)/((1-x)^2*(1-2*x)*(1-3*x)).at n=9A187693
• Semiprimes whose prime factors differ from each other in one bit position only.at n=58A261077
• Triangle T(n,f): the number of bicolored connected cubic graphs on 2n vertices with f vertices of the first color.at n=51A321304
• Triangle T(n,f): the number of bicolored connected cubic graphs on 2n vertices with f vertices of the first color.at n=61A321304
• Number of connected cubic graphs on 2n unlabeled vertices rooted at a pair of indistinguishable vertices.at n=6A361408