-4215

Appears in sequences

• Expansion of 1/(1+x+2*x^2-2*x^3).at n=19A077977
• Expansion of sqrt(1-4*x)/(1-3*x).at n=8A137720
• G.f.: A(x) = 1 + x/exp( Sum_{k>=1} (A((-1)^k*x) - 1)^k/k ).at n=17A157674
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 141", based on the 5-celled von Neumann neighborhood.at n=37A270285
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 217", based on the 5-celled von Neumann neighborhood.at n=43A270912