Using a size P hook.
Start with 8 chain stitches (ch) and close them to a ring with a slip stitch (sl)
Round 1: ch 1, 15 single crochets(sc) to the ring, 1 sl to close the row
Round 3: ch 3, 2dc, 1ch, 3dc into same space, *ch1, into next space 3dc, ch1, 3dc* for entire round, at end of the round ch1 and join with a slst to 3rd chain of original 3ch.
Rounds 4 and 5: ch3 into the same space, make 2dc, *ch1, 3dc into next space* repeat until end of round and join with a slst into 3rd ch of original 3ch. Each 1ch space should be filled with 3dc each cluster separated with 1ch.
Round 6: Just like round 3 but increasing every 2. Ch 3 into the same space, 2dc, ch1, 3dc, *ch1, into next space 3dc, ch1, into next space 3dc, ch1, 3dc* repeat for the entire round and at end of the round ch1 and join with a slst to 3rd chain of original 3ch.
Rounds 7, 8, and 9: No increases just repeat round 4
Round 10: Increasing again but every 3.
Rounds 11, 12, and 13: No increases repeat round 4
Any subsequent rounds repeat sequence of rounds 10, 11, 12, and 13 until it is as big as you want it.
Note: Don't end on an increasing round make sure you follow it with 3 regular rounds. Increasing rounds are a little misshapen and it takes 3 regular rounds to normalize.
Ch 3 into the same space, 1 dc, *ch 2, into next space 2 dc, ch 2, 2 dc, into next space ch 2, 2dc, ch 2, 2 dc* repeat for the entire round then ch 2, 2 dc into the same space as the first st. Join with a slst and fasten off.
Let me know if you have any questions.