3842389

Appears in sequences

• a(0) = 1, a(1) = 4, and a(n) = a(n-1) + a(n-2) for n >= 2.at n=30A000285
• Generalized Pellian with second term of 9.at n=10A048878
• Expansion of (1+2*x)/(1-3*x+x^2).at n=15A054486
• Fibonacci sequence with initial values a(0) = 3 and a(1) = 1.at n=31A104449
• y-values in the solution to x^2 - 20*y^2 = 176.at n=30A228208
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = 1, a(1) = 3, a(2) = 5, a(3) = 7.at n=30A295717