51275

Appears in sequences

• a(n) = (7*n^3 + 6*n^2 + 5*n) / 6.at n=35A101165
• Triangle read by rows, 1 <= k <= n: T(n,k) = non-isomorphic colorings of a toroidal n X k grid using exactly four colors under translational symmetry and swappable colors.at n=16A294793