Chain odd number.
Row 1 (WS): Begin from 2nd chain from hook, sc in remaining chains.
Row 2: Ch1, turn. Dc in first st, *skip next st, dc in next st, dc in the skipped st. Repeat from * to last st. Dc in last st.
Row 3: Ch1, turn. Sc in all sts.
Repeat Row 2 and Row 3 until you reach your desired length.