4250681

Appears in sequences

• a(n) = (F(8*n+3) + F(8*n+1))/3, where F = A000045 (the Fibonacci sequence).at n=4A049676
• a(n) = L(4*n+2)/3, where L=A000032 (the Lucas sequence).at n=8A049685
• Primitive part of Lucas(n).at n=33A061447
• Triangle T(n, k) = (k*ChebyshevU(n, (k+2)/2) + 2*ChebyshevT(n+1, (k+2)/2))/2.at n=25A121872
• Expansion of (x-x^3)/(1-3*x+2*x^2-3*x^3+x^4).at n=17A140824
• a(n) = Product_{k=1..(n-1)/2} (5 + 4*cos(k*Pi/n)^2).at n=17A152119
• 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=15A227214
• a(n) = (a(n-1) * a(n-5) + 1) / a(n-6), a(0) = a(1) = ... = a(5) = 1.at n=45A276529
• Rectangular array R read by descending antidiagonals: divide the multiples of 3 in the Wythoff array (A035513) by 3, and delete all others.at n=37A328697