56143

Appears in sequences

• a(n) = -a(n-1) - 2*a(n-2).at n=33A001607
• a(n) is the unique odd positive solution x of 2^n = 7x^2+y^2.at n=32A077020
• Expansion of (1 + 2*x)/(1 + 3*x + 4*x^2).at n=16A087168
• Lucas and Lehmer numbers with parameters (1 +- sqrt(-7))/2.at n=33A107920
• Row sums of the Riordan array (1-4x+4x^2, x(1-2x)) (A167431).at n=30A167433
• Number of compositions of n, where the difference between the number of odd parts and the number of even parts is 2.at n=18A242500
• Number of n-length words w over a 9-ary alphabet {a_1,...,a_9} such that w contains never more than j consecutive letters a_j (for 1<=j<=9).at n=5A242632
• 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=33A247487
• a(n) = 3*a(n-1) - 4*a(n-2) with a(0) = a(1) = 1.at n=16A247560
• 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=33A247564