-4049

Appears in sequences

• a(n) = -a(n-1) - 2*a(n-2).at n=25A001607
• Expansion of (1 + 2*x)/(1 + 3*x + 4*x^2).at n=12A087168
• Lucas and Lehmer numbers with parameters (1 +- sqrt(-7))/2.at n=25A107920
• Row sums of the Riordan array (1-4x+4x^2, x(1-2x)) (A167431).at n=22A167433
• Expansion of (2 + x + x^2 + x^3 - x^4 - 2*x^5 - 4*x^6 - 8*x^7) / (1 - x^4 + 16*x^8) in powers of x.at n=25A247487
• a(n) = 3*a(n-1) - 4*a(n-2) with a(0) = a(1) = 1.at n=12A247560
• a(n) = 3*a(n-2) - 4*a(n-4) with a(0) = 2, a(1) = 1, a(2) = 3, a(3) = 1.at n=25A247564
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 147", based on the 5-celled von Neumann neighborhood.at n=33A270293