10182505537
domain: N
Appears in sequences
- Denominators of continued fraction convergents to sqrt(5).at n=17A001076
- a(n) = Fibonacci(6*n + 3)/2.at n=8A007805
- Denominators of continued fraction convergents to sqrt(20).at n=16A041031
- Denominators of continued fraction convergents to sqrt(45).at n=24A041077
- Denominators of continued fraction convergents to sqrt(80).at n=16A041143
- Nonprimes which are the average of two consecutive Fibonacci numbers.at n=15A071683
- Greedy frac multiples of sqrt(5): a(1)=1, sum(n>0,frac(a(n)*x))=1 at x=sqrt(5).at n=24A079936
- a(n) = floor((Fibonacci(2*n+1)+1)/2).at n=25A087953
- 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=24A099511
- Antidiagonal sums of number triangle A086645.at n=25A108479
- Expansion of (1-x)^3/(1-4x+5x^2-4x^3+x^4).at n=25A109961
- Triangle T(n, k) = 2*(-1 + 2*k)*T(n-1, k) - T(n-2, k) with T(-2, k) = T(-1, k) = 1, read by rows.at n=33A122053
- Negative of the Hankel transform of C(n) - C(n+2), where C = A000108.at n=24A138268
- Denominators of continued fraction convergents to sqrt(5/4).at n=16A153315
- Hypotenuses of primitive Pythagorean triples in A195547 and A195548.at n=24A195549
- One half of the even Markoff nunbers.at n=27A388289