67108683

Appears in sequences

• a(n) = Sum_{k=0..n} C(n-k, floor(k/2))*2^k.at n=26A097334
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 549", based on the 5-celled von Neumann neighborhood.at n=25A289102