Q:

Cannot find a calculator that can handle 220! x 40000

For a game I am playing, I am trying to calculate the cost of purchasing all the expansion area squares on a level. the first square costs 40,000, each next square costs an additional 40,000 more than the previous square. the level is 16 x 16 squares and I start with 6 x 6 already open. I figure the math to solve is 220! x 40000, I cannot find a calulator online or irl that can handle the problem. I found a factorial calc which solves 220! but it wont let me do x 40000. 
Is there a math trick to solving this problem? or an easy way to solve it?

A:

It's $(1\color{blue}{+}2\color{blue}{+}3\color{blue}{+}...\color{blue}{+}220)×40,000$, not $(1×2×3×...×220)×40,000$.  The correct formulation should be easy to do on a calculator, especially if you recall the triangular of $n$ is $1+2+3+...+n=n(n+1)/2$.

