283989

Appears in sequences

• a(n) = a(n-1) + 4a(n-2) - 4a(n-3).at n=18A136326
• Decimal representation of the middle column of the "Rule 91" elementary cellular automaton starting with a single ON (black) cell.at n=18A267045
• Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 526", based on the 5-celled von Neumann neighborhood.at n=9A272743
• a(n) = 4^(n+1) + (4^n-1)/3.at n=8A330246
• Array A read by upward antidiagonals in which the entry A(n,k) in row n and column k is defined by A(n, k) = 4^n*(6*k - 3 - 2*(-1)^n) + (4^n - 1)/3, n,k >= 1.at n=38A371100