20170

Appears in sequences

• (1/12)*number of right triangles that can be formed from the points of an (n+1)X(n+1)X(n+1) lattice cube.at n=4A103499
• List of coefficients of reduced chromatic polynomial of icosahedron, highest order terms first.at n=8A296916
• Order 3 perimeter magic squares of magic sum n, all elements distinct and 1 in the set; bracelet symmetry.at n=40A382455