518408351

Appears in sequences

• a(0) = 1, a(1) = 5, a(n) = 4*a(n-1) - a(n-2).at n=15A001834
• a(2*n) = a(2*n-1) + a(2*n-2), a(2*n+1) = 2*a(2*n) + a(2*n-1); a(0) = a(1) = 1.at n=31A002531
• Limit of the sequence obtained from S(0) = (1,1) and, for n > 0, S(n) = I(S(n-1)), where I consists of inserting, for i = 1, 2, 3..., the term a(i) + a(i+1) between any two terms for which 7*a(i+1) <= 11*a(i).at n=30A082630
• Expansion of (1 + x + x^2)/(1 - 4x^2 + x^4).at n=30A108412
• Number of Khalimsky-continuous functions with a three-point codomain.at n=29A131887
• Numerators of the lower principal convergents and the lower intermediate convergents to 3^(1/2).at n=30A143643
• Numerators of fractions x^n + y^n, where x + y = 1 and x^2 + y^2 = 2.at n=30A173299
• a(n) = MPR2(n, 4), where MPR2(n, x) is the (monic) minimal polynomial of 2*cos(2*Pi/n) as defined in A232624.at n=30A309040
• Expansion of ((Product_{k>=1} (1 - x^k)^2/(1 - 4*x^k + x^(2k))) - 1)/2.at n=16A386706