This apparently fits the bill: https://patricksurry.github.io/posts/flowsnake/ https://patricksurry.github.io/posts/flowsnake/. Amit's post led me to search abo

This apparently fits the bill: https://patricksurry.github.io/posts/flowsnake/ https://patricksurry.github.io/posts/flowsnake/. Amit's post led me to search about recursive coordinates for hexes again and I came across it in a StackExchange comment.