49936

Appears in sequences

• Number of nondividing sets on {1,2,...,n}.at n=45A051014
• The Wiener index of the Bethe cactus lattice graph E_n defined pictorially in the Hosoya - Balasubramanian reference.at n=3A221046
• Numbers k such that k!!! - 3^k is prime.at n=36A261316
• Place n equally spaced points on each side of a square, and join each of these points by a chord to the 3*n new points on the other three sides: sequence gives number of edges in the resulting planar graph.at n=8A367279
• Table read by antidiagonals: Place k equally spaced points on each side of a regular n-gon and join every pair of these n*k points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of edges in the resulting planar graph.at n=46A367305