427007

Appears in sequences

• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 189", based on the 5-celled von Neumann neighborhood.at n=19A279719
• a(n) = Sum_{k=0..n} binomial(4*n,k) * binomial(4*n-k-1,n-k).at n=5A370101