What would a chart of energy output of elements of mass X fused with hydrogen look like? What about X fused with X?
See for example this table which contains the excess energy for each nuclide. You can take this table to compute the number you are interested in. The answer depends not only on the atomic number, but on the number of neutrons as well. This is why you need to think about how you want to represent this.
I recommend you study that table and then figure out how best to map it out. For example, if you take the entry for 3H, it shows an excess energy of 3.087994 MeV / nucleon; If you add a proton, it would turn into 4He, with an excess energy of 7.465077 MeV/nucleon. From this you can derive the energy released in the fusion to be
4*7.47 - 3*3.09 = 20.61 MeV
I was not able to verify this number - for most fusion reactions, the D+T reaction is used instead of H+T...
Doing this for every combination will take a bit of time and calculation... but this should get you going.