1466439680

Appears in sequences

• a(n) = 2*a(n-1) + 2*a(n-2) for n > 1; a(0)=2, a(1)=2.at n=21A080040
• a(n) = floor((1+sqrt(3))^n).at n=21A080041
• Expansion of 2*(1+2*x) / (1-8*x+4*x^2).at n=10A270444