25272721

Appears in sequences

• a(n) = 5*a(n-1) - a(n-2), with a(1)=1, a(2)=4.at n=11A004253
• Numerators in continued fraction [0; 1, 3, 1, 3, 1, 3, ...].at n=22A136210
• Denominators in continued fraction [0; 1, 3, 1, 3, 1, 3, ...].at n=21A136211
• a(n) = (a(n-1)*a(n-3) + 1) / a(n-4) with a(0) = a(1) = a(2) = a(3) = 1.at n=36A217787
• Generalized Markoff numbers: union of numbers a, b, c, d, e satisfying the Markoff(5) equation a^2 + b^2 + c^2 + d^2 + e^2 = 5*a*b*c*d*e.at n=24A229242