Trinity Stitch (Seed Stitch)
How-To Video https://youtu.be/2YlT5drFF6Y
This pattern requires 4 sts, In the image above I used 20 sts, I repeated the patter 3 times in total.
Row 1 (RS) Purl to end
Row 2 *(K1, P1, K1) into first stitch, P3tog, Rep from* to end.
Row 3 Purl to end
Row 4 *P3tog, (K1, P1, K1) into the next stitch, Rep from* to end
Repeat rows 1 to 4