How to find the palette number of a color in roblox studio

/*
paste this into your brower's console (f12) and replace row and left pos by the correct numbers, like this :
https://devforum-uploads.s3.dualstack.us-east-2.amazonaws.com/uploads/original/4X/a/0/9/a096e6c7814a4797bb608f85b8058ba4b15eff10.png
*/

let row = 2 // Change this to the row of the color
let offset = 4 // Offset of the color from the left

row = row - 1
let pos = 0
for(let i = 1; i <= row; i++) {
    if (i >= 7) {
        pos += 13-(i-7)
    } else {
       pos += 7+i-1
    }
}
console.log(pos + offset)