This document provides the number of needed marbles to build a pyramid that has an n-number of marbles on one side.
It also plots the result pyramid
Examples that you can type to start:

N_of_Marbles (3);
Calculates how many marbles are needed for a 3-marble side. Result: (3 + 2 + 1) for the first floor + (2 + 1) for the second, plus the last floor (1) = 10
Plot_Marbles(5,300);
Plots the pyramid, with balls of relative size of 300
Plot_Evolution(5);
Plots the evolution of the number of needed marbles from 1 to 5

Written by Francesc Melia Sune