509015

Appears in sequences

• Sum along upward diagonal of Pascal triangle from (but not including) center.at n=32A010756
• Sum along upward diagonal of Pascal triangle from center.at n=32A010757
• a(n) = T(n, 2*n-10), T given by A027926.at n=16A027933
• a(n) = A136431(n,n).at n=11A176085
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 569", based on the 5-celled von Neumann neighborhood.at n=21A283067