-3123

Appears in sequences

• Row sums of triangle A104505, which is equal to the right-hand side of the triangle A084610 of coefficients in (1+x-x^2)^n.at n=15A104507
• Expansion of 1/((1 +x +x^2)^2 *(1 +x^2 +x^3)^3).at n=31A167177
• Triangle read by rows: T(n,k) is the k-th generalized Eulerian number of order n and degree 3, n >= 1.at n=32A211233
• Coefficient of x^2 in minimal polynomial of the continued fraction [1^n,2/3,1,1,1,...], where 1^n means n ones.at n=7A266704
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 355", based on the 5-celled von Neumann neighborhood.at n=33A271408