-139657

Appears in sequences

• a(n) = -a(n-1) - 2*a(n-2).at n=35A001607
• Expansion of (1 + 2*x)/(1 + 3*x + 4*x^2).at n=17A087168
• Lucas and Lehmer numbers with parameters (1 +- sqrt(-7))/2.at n=35A107920
• Row sums of the Riordan array (1-4x+4x^2, x(1-2x)) (A167431).at n=32A167433