This can be knitted as charted, but for a squarer mesh use special decreases. Instead of ssk, insert the right needle purlwise into the first stitch on the left needle and knit the second stitch through it, dropping both stitches from needle. Instead of k2tog, pass the second stitch on the left needle over the first and off the needle, then knit the first stitch.
Shown with a cast-on count of 26 stitches.