199691526

Appears in sequences

• a(n) = (F(8*n+3) + F(8*n+1))/3, where F = A000045 (the Fibonacci sequence).at n=5A049676
• a(n) = L(4*n+2)/3, where L=A000032 (the Lucas sequence).at n=10A049685
• Expansion of (x-x^3)/(1-3*x+2*x^2-3*x^3+x^4).at n=21A140824
• a(n) = Product_{k=1..(n-1)/2} (5 + 4*cos(k*Pi/n)^2).at n=21A152119
• Generalized Markoff numbers: largest of 7-tuple of positive numbers a, b, c, d, e, f, g satisfying the Markoff(7) equation a^2+b^2+c^2+d^2+e^2+f^2+g^2 = 7abcdefg.at n=22A227214