Free pattern and video tutorial on Crafting Happiness
https://craftinghappiness.com/textured-cluster-stitch-tut...

The Textured Cluster Stitch is a two-row repeat crochet pattern constructed with clusters of different height stitches and back post single crochet stitches that creates a textured fabric that looks like clusters stacked on top of each other. It works great for baby blankets, modern afghans, garments, shawls and hats.

The Textured Cluster Stitch is easy to learn and once you make a few rows, you will be able to replicate the pattern without counting stitches or keeping count of rows.