110848

Appears in sequences

• Number of ordered factorizations with 2 levels of parentheses indexed by prime signatures.at n=30A050357
• Numbers n such that sopf(n) = sopf(n-1) - sopf(n-2), where sopf(x) = sum of the distinct prime factors of x.at n=17A076527
• Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.at n=8A121139
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant = 1 (mod 3).at n=24A211034
• Irregular triangular array T; row n shows the coefficients of the (n-1)-st polynomial in the obverse convolution s(x)**t(x), where s(x) = x+F(n) and t(x) = F(n), where F(n) = n-th Fibonacci number (A000045). See Comments.at n=29A375048
• a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^k * binomial(2*k+2,2*n-6*k+1).at n=21A387552