54476

Appears in sequences

• a(n) = Sum_{k=0..n} C(n,k)*sigma(n+k) for n>=1.at n=10A181411
• Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from an n x n square grid of points when each pair of points is connected by a circle and the points lie at the ends of a diameter of the circle.at n=27A360354