-1398100

Appears in sequences

• a(n) = -a(n-1) + 2*a(n-2), a(0)=1, a(1)=2.at n=22A084247
• Expansion of (1+x-4*x^2) / ((1+x)*(1-4*x^2)).at n=22A087213
• a(n) = (1/3)*(1 - (-2)^n + 3*(-1)^n ) = (-1)^(n+1)*A167030(n).at n=22A167193