Shown with a cast-on count of 3 stitches.  

• Round 1: K3.
• Round 2: BrSl, 1-to-5 inc, brSl (7 sts).
• Round 3: [K1, brSl] 3 times, k1.
• Round 4: BrSl, (k1, yo, k1) in next st, brSl, k1, brSl, (k1, yo, k1) in next st, brSl (11 sts).
• Round 5: [K1, brSl] 5 times, k1.
• Round 6: BrSl, (k1, yo, k1) in next st, [brSl, k1] 3 times, brSl, (k1, yo, k1) in next st, brSl (15 sts).
• Round 7: [K1, brSl] 7 times, k1.