-1315

Appears in sequences

• a(n) = 2*a(n-1) - a(n-2) - (a(n-1)^2 + a(n-2)^2).at n=5A122590
• E.g.f. satisfies: A(x) = x*exp( A(x)/A'(x) ).at n=4A193332
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 497", based on the 5-celled von Neumann neighborhood.at n=27A272559
• a(n) = Sum_{i=1..n} i^2*(-1)^ceiling(sqrt(i)).at n=21A392677