Sum of consecutive (pyramidal) squares

Description

In mathematics, a pyramid number, or square pyramidal number, is a figurate number that represents the number of stacked spheres in a pyramid with a square base. Square pyramidal numbers also solve the problem of counting the number of squares in an n × n grid. The sum of the squares of any number of consecutive integers starting with 1.
1, 5, 14, 30, 55, 91, 140, 204, 285, 385, 506, 650, 819 …