The function is: f(n) = (n-th triangular number) ^ 2
So, f(1) = (first triangular number) ^ 2
the '^ 2' means "multiply the number by itself", e.g., '3^2' is '9'.
And, f(2) = (second triangular number) ^ 2
and, f(3) = (third triangular number) ^ 2
So, what is a "triangular number" ?
Do an Internet search for "definition triangular number",
and you may find the web-page;
http://www.mathsisfun.com/definitions/triangular-number.html
which gives a definition, plus pictures to help you visualize why they are called "triangular". Hint: a "tri-angle" has 3 sides, while a "quad-rangle" has 4 sides.
Formulas are used to specify calculations based on values in designated cells. Excel supports basic calculations as well as statistical, trigonometric and other specialized functions.
Formulas used in Excel must follow a certain syntax.
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