499121

Appears in sequences

• a(n) = 9*a(n - 1) - a(n - 2) for n>1, a(0)=0, a(1)=1.at n=7A018913
• Denominators of continued fraction convergents to sqrt(77).at n=13A041137
• Denominators of continued fraction convergents to sqrt(308).at n=13A041581
• A product triangle sequence based on recursion:a=4; f(n,a)=(2*a+1)*f(n-1,a)+f(n-2,a).at n=29A173005
• A product triangle sequence based on recursion:a=4; f(n,a)=(2*a+1)*f(n-1,a)+f(n-2,a).at n=34A173005
• a(n) = U(n, (n+3)/2) where U(n, x) is a Chebyshev polynomial of the 2nd kind.at n=6A342168