25508

Appears in sequences

• Expansion of (1-x)*(1+x)/(1-3*x-x^2+2*x^3).at n=9A052939
• Coefficient array of orthogonal polynomials P(n,x)=(x-n)*P(n-1,x)-(n-1)^2*P(n-2,x), P(0,x)=1, P(1,x)=x-1.at n=39A182823
• Number of permutations of n letters in the class Av_n(213;2).at n=5A220903
• Number of length n arrays of permutations of 0..n-1 with each element moved by -5 to 5 places and the median of every three consecutive elements nondecreasing.at n=9A263594
• Function of natural numbers satisfying the properties a(2*n) = 2*a(n) and a(2*n+1) = -3 + 2*a(3*n+2).at n=36A309154
• Number of edges among all distinct circles that can be constructed from n equally spaced points along a line using only a compass.at n=14A359254
• Numbers X such that X^2 + Y^2 = 2^(2*k) + 1 and X > Y > 0 and k is the binary digit length of X-1.at n=45A369703
• Number of minimal vertex cuts in the n-trapezohedral graph.at n=15A387587