Problem: How many ways are there to use 8s strung together ...

The mean for row 20 should be 400. Students in the class found various ways to describe the 1st number of the nth row. They include: n(n-1) + 1; i.e. the row number times the previous row number plus 1. n2 – (n – 1); i.e. the mean of the row (or square of the row number) minus the previous row # ................
................