18891

Appears in sequences

• a(n) = Sum_{k=0..floor(n/2)} A027144(n-k, k).at n=17A027154
• a(n) = 81*n^2 - 118*n + 43.at n=16A156677
• Partial sums of A057429.at n=25A172512
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 89", based on the 5-celled von Neumann neighborhood.at n=29A270131
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 89", based on the 5-celled von Neumann neighborhood.at n=30A270131
• a(n) = Sum_{k=0..floor(2*n/5)} (k+1) * binomial(k,2*n-5*k).at n=35A392268