425972

Appears in sequences

• Expansion of x*(1-x)/((1-2*x)*(1+3*x)).at n=13A091004
• a(n) = a(n-1) + 6*a(n-2) for n >= 2, a(0)=1, a(1)=2.at n=12A133467
• Number of (n+1)X(n+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=11A250652
• One third of the number of edges in the metrically regular triangulation of the n-th approximation of the Koch snowflake fractal.at n=6A282563