Shown with a cast-on count of 18 stitches.  

• Row 1 (RS): *[1/1 LC] 3 times, k3, repeat from *.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Purl.
• Row 3: *K1, [1/1 LC] 3 times, k2, repeat from *.
• Row 5: *K2, [1/1 LC] 3 times, k1, repeat from *.
• Row 7: *K3, [1/1 LC] 3 times, repeat from *.
• Row 9: *K3, [1/1 RC] 3 times, repeat from *.
• Row 11: *K2, [1/1 RC] 3 times, k1, repeat from *.
• Row 13: *K1, [1/1 RC] 3 times, k2, repeat from *.
• Row 15: *[1/1 RC] 3 times, k3, repeat from *.