194461

Appears in sequences

• Number of length-4 0..n arrays with no adjacent pair x,x+1 repeated.at n=20A269657
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 539", based on the 5-celled von Neumann neighborhood.at n=8A272802
• a(n) = Fibonacci(n) represented in bijective base-9 numeration.at n=25A282240