I think I found a potential issue with the grey background/white text picture here
It has separate explanations for (e, 1) and (1, n). The (1, n) part refers to a VQC post here https://archive.fo/fyzAu#selection-12381.0-12381.107 that says "each "a" from the first row equals na because xx+e = 2na and na is half of that. That's BIG part of the KEY". Row one where n=1 isn't (1, n). It's (e, 1). n denotes rows, so row one where n=1 in (1, n) refers specifically to (1, 1). So if we're sorting a more detailed OP for the next thread #13, someone might want to correct that.