-8839

Appears in sequences

• Real part of (1 + 2*i)^n, where i is sqrt(-1).at n=13A006495
• a(n) = 2*a(n-1) - a(n-2) - a(n-4) with a(0) = a(1) = 0, a(2) = 1, a(3) = 2.at n=26A014292
• Expansion of 1/(1 - 4*x + 5*x^2).at n=12A099456
• Column 0 of triangle A118435.at n=13A118436
• G.f.: imaginary part of 1/(1 - i*x - i*x^2) where i=sqrt(-1).at n=26A201838