1663585
domain: N
Appears in sequences
- Denominators of continued fraction convergents to sqrt(15).at n=14A041023
- a(n) = 8*a(n-1) - a(n-2), a(0)=1, a(-1)=1.at n=7A070997
- a(n)*a(n+3) - a(n+1)*a(n+2) = 3, given a(0)=a(1)=1, a(2)=4.at n=15A080871
- Triangle T(n, k) = (k*ChebyshevU(n, (k+2)/2) + 2*ChebyshevT(n+1, (k+2)/2))/2.at n=20A121872
- Numerators in continued fraction expansion of sqrt(3/5).at n=14A145542
- Define a(x,y) to be 1 if x is 0 or 1 and y*a(x-1,y)-a(x-2,y) otherwise. Then the n-th term of the sequence is a(n,n).at n=8A218219
- Generalized Markoff numbers: largest number a in a 5-tuple a >= b >= c >= d >= e satisfying the Markoff(5) equation a^2 + b^2 + c^2 + d^2 + e^2 = 4*a*b*c*d*e.at n=33A229241