To use summation, you can find sigma in the Desmos keyboard (under FUNCTIONS and then misc) or by typing "sum":
If you populate the upper and lower bound, Desmos will output the summation answer.
You can also put a parameter for the upper and/or lower limits:
If you'd like to learn more about summation, check out the Summation page at Learn Desmos:
Why can't I use a_n to represent a_0 at n=0 or any other n value?
Anthony, just use a function a(n) instead.
My problem is that Desmos seems to quit when computing a sum without telling me that it has quit!
Edit: Nevermind, I was just being sloppy: I defined the piecewise functions I was summing over with <'s instead of <='s!
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