-2599

Appears in sequences

• a(n) = -2*a(n - 1) -a(n - 2) -a(n - 3), a(0) = a(1) = a(2) = 1.at n=15A056016
• a(n)=1-4*n-4*n^2.at n=25A184882
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 261", based on the 5-celled von Neumann neighborhood.at n=25A271064
• Expansion of Product_{k>0} 1/(1 + x^k)^(k*3).at n=21A279031
• G.f.: Sum_{n=-oo..+oo} n * x^n * (1 - x^n)^n.at n=48A291937