Calculus, visualizations, animations, AP Calculus
SeeingSeries.nb allows the user to enter an explicit formula for the terms of a sequence. Then it animates the pattern of the sequence of partial sums. This is particularly helpful to understand conditional convergence with alternating series, but it may be used on series with all positive terms, whether convergent or divergent.
Dover, R. (2017). Seeing series [Mathematica notebook]. Retrieved from http://digitalcommons.imsa.edu/mathematica_notebooks/33/