889328

Appears in sequences

• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 297", based on the 5-celled von Neumann neighborhood.at n=9A271149
• Expansion of (1+x-3*x^2) / ( 1-2*x-4*x^2+6*x^3 ).at n=14A271894