Hello Senpai!
>Take products, c, that have odd x+n. And even n.
>Take one from x+n.
>8 triangles.
>Create a table.
I've included an updated sheet soon including f and 2(n-1) and how they contribute to the 8 triangles. PMA and I spent a lot of time working to understand this! This is the lock and key, isn't it? I'm excited to work on this again.