8140625

Appears in sequences

• Scaled Chebyshev U-polynomial evaluated at sqrt(5)/2.at n=12A030191
• Binomial transform of Fibonacci(2n).at n=13A093131
• a(n) = Sum_{k>=0} (-1)^k*binomial(n, 5*k+2).at n=27A289387
• a(n) = Sum_{k>=0} (-1)^k*binomial(n, 5*k+2).at n=28A289387
• a(n) = Sum_{k=1..n} sigma_2( (n/gcd(k,n))^2 ).at n=24A372996