20536

Appears in sequences

• Permutation of N induced by rotating the node 5 left in the infinite planar binary tree shown at A065658.at n=43A065669
• Number of (w,x,y,z) with all terms in {1,...,n} and |x-y| = w + |y-z|.at n=35A212683
• van Heijst's upper bound on the number of squares inscribed by a real algebraic curve in R^2 of degree n, if the number is finite.at n=17A239352
• Number of compositions (ordered partitions) of n into pentagonal pyramidal numbers (A002411).at n=42A322853
• Numbers m such that m*(m-tau(m))/sigma(m) is an integer h where k-tau(k) is the number of nondivisors of k (A049820) and sigma(k) is the sum of the divisors of k (A000203).at n=40A325020
• Number of T_0 set-systems covering a subset of {1..n} that are closed under intersection.at n=5A326959
• Number of integer partitions of n whose distinct parts have non-integer median.at n=42A360689
• Expansion of Sum_{k>0} x^(4*k)/(1-x^k)^4.at n=49A363611
• G.f. A(x) satisfies A(x) = 1 / (1 - x - x * (1 + x) * A(x^2)).at n=10A367655
• Numbers m with deficiency 32: sigma(m) - 2*m = -32.at n=4A387352