plotting – Plot summation of Madeline Constant

I am currently trying to plot my Madeline constant as a function of the atoms on the edge parameter (Dictated by variable x). The typical formula can be seen here.

I have simplified it so that j=k=l=x in this case, assuming a cubic lattice. I am attempting to plot the constant using

constant = Table({Sum(((-1)^(3*x))/(3*x^2)^(1/2), {x, 1, 10}), 10}, {x, 1, 10})

My goal is to create a table of outputs corresponding to each atomic value (x = positive integers). However, I am not getting a proper list of values. What am I missing to be able to listplot my function?

Thank you for the help!