Techniques used 
K: Knit
P: Purl
Yo: Yarn over
P2tog: Knit 2 together
S2kp: Slip 2 knitwise together, knit 1, pass slipped stitches over
Pattern
Multiple of 18, + 1.
Row 1 (RS): k1, *yo, k1, (p3, k1) x4, yo, k1*.
Rows 2, 4, 6, 8, 10, and 12: Purl.
Row 3: k2, *yo, k1, (p3, k1) x4, yo, k3*, yo, k1,(p3, k1) x4, yo, k2.
Row 5: k3, *yo, k1, (p3, k1) x4, yo, k5*, yo, k1, (p3, k1) x4 4 times, yo, k3.
Row 7: k4, *yo, k1, (p2tog, p1, k1) x4, yo, k7*, yo, k1, (p2tog, p1, k1) 4 times, yo, k4.
Row 9: k5, *yo, k1, (p2tog, k1) x4, yo, k9*, yo, k1, (p2tog, k1) 4 times, yo, k5.
Row 11: k6, *yo, k1, (s2kp, k1) x2, yo, k11*, yo, k1, (s2kp, k1) x2, yo, k6.
Repeat rows 1-12.