59080

Appears in sequences

• Red rooted red-black trees with n internal nodes.at n=20A001138
• Number of rooted toroidal maps with 2 vertices and n faces and no isthmuses.at n=4A006425
• a(n) = 9^n + 2^n - 1.at n=5A155593
• a(n) = 3^n + 3*n + 1.at n=10A176805
• G.f. A(x) satisfies: 0 = [x^(n-1)] 1 / A(x)^(n^2+n-1) for n>2.at n=6A303562
• Nonunitary weird numbers: numbers that are nonunitary abundant but not nonunitary pseudoperfect.at n=20A327948
• Triangle read by rows: T(n,k) is the number of rooted toroidal maps with n edges and k faces and without isthmuses, n >= 2, k = 1..n-1.at n=19A343092