1485607537

Appears in sequences

• Least positive integer k such that the fractional part of k*sqrt(5) has its n initial partial quotients all equal to 1.at n=22A004794
• a(n) = floor((Fibonacci(2*n+1)+1)/2).at n=23A087953
• Row sums of triangle A099510, so that a(n) = Sum_{k=0..n} coefficient of z^k in (1 + 2*z + z^2)^(n-[k/2]), where [k/2] is the integer floor of k/2.at n=22A099511
• a(n) = floor[(phi + n mod 2)*a(n-1)], a(1)=1.at n=31A107857
• a(n) = b(k), where b(k) = Fibonacci(n-1) and k = floor( n*(1+sqrt(5))/2 ).at n=31A107858
• Expansion of (1-x)^3/(1-4x+5x^2-4x^3+x^4).at n=23A109961
• a(n) = (Fibonacci(3*n-1) + 1)/2 for n >= 1.at n=15A292278
• Numbers k such that the k-th centered 40-gonal numbers (A195317) is a square.at n=15A351354