-5528

Appears in sequences

• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 51", based on the 5-celled von Neumann neighborhood.at n=39A270021
• Expansion of ((1 + 4*x + 8*x^2)^(3/2) - (1 + 6*x + 18*x^2 + 20*x^3)) / (2*x^4) in powers of x.at n=11A282876
• a(n) = Sum_{i=1..n} i^2*(-1)^ceiling(sqrt(i)).at n=43A392677