218945

Appears in sequences

• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 841", based on the 5-celled von Neumann neighborhood.at n=8A273684
• Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=7A302325