Thanks for these latest tips VQC.
I feel like this is so close to revealing the answer directly… I'm working on 'em now.
In (0,1) * (0, 1) the pattern is:
02 = 0 = 160 = 4^2 * 0^2
28 = 16 = 161 = 4^2 * 1^2
818 = 144 = 169 = 4^2 * 3^2
1832 = 576 = 1636 = 4^2 * 6^2
3250 = 1600 = 16100 = 4^2 * 10^2
5072 = 3600 = 16225 = 4^2 * 15^2
So each row is 4^2 * a triangle number squared (in order).
Going to try to extend this to other e & -f cols…