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Abbreviations
ch chain(s)
sc single crochet(s)
dc double crochet(s)
( ) contains explanatory information
* * instructions between asterisks should be repeated as many times as there are stitches to accommodate them

Multiple of 11 ch, plus 10 for symmetry, plus 4

Row 1: 3 dc in sixth ch from the hook (first two skipped chains count as first dc now and throughout), skip 4 ch, 3 dc in next ch, *ch 3, skip 2 ch, sc in next ch, ch 3, skip 2 ch, 3 dc in next ch, skip 4 ch, 3 dc in next ch*, skip 2 ch, dc in next ch. Chain 2, turn.

Row 2: 3 dc in next dc, skip 4 dc, 3 dc in next dc, *ch 3, sc in next sc, ch 3, 3 dc in next dc, skip 4 dc, 3 dc in next dc*, dc in next dc. Ch 2, turn.

Row 3: 3 dc in next dc, skip 4 dc, 3 dc in next dc, *ch 3, sc in next sc, ch 3, 3 dc in next dc, skip 4 dc, 3 dc in next dc*, dc in next dc. Ch 2, turn.

Row 4: dc in next dc, *ch 3, sc in space between next 2nd and 3rd dc (it’s the space between two shells), ch 3, skip next 2 dc, 3 dc in next dc, 3 dc in next dc*, ch 3, sc in space between next 2nd and 3rd dc, ch 3, skip next 2 dc, dc in next 2 dc. Ch 2, turn.

Row 5: dc in next dc, *ch 3, sc in next sc, ch 3, 3 dc in next dc, skip next 4 dc, 3 dc in next dc*, ch 3, sc in next sc, ch 3, dc in next 2 dc. Ch 2, turn.

Row 6: dc in next dc, *ch 3, sc in next sc, ch 3, 3 dc in next dc, skip next 4 dc, 3 dc in next dc*, ch 3, sc in next sc, ch 3, dc in next 2 dc. Ch 2, turn.

Row 7: 3 dc in next dc, *3 dc in next dc, ch 3, sc in space between next 2nd and 3rd dc, ch 3, skip next 2 dc, 3 dc in next dc*, 3 dc in next dc, dc in next dc. Ch 2, turn.

Repeat from row 2.