311295

Appears in sequences

• a(n) = T(2, n), where T is the array given by A047858.at n=15A047859
• a(n) = 19*2^n-1.at n=14A198276
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 217", based on the 5-celled von Neumann neighborhood.at n=21A286741