Rd1 : Magic circle or ch 5 joined with sl st,then 8 x dc. in the loop
Rd 2: Multiply one dc. at each one stich = 16 dc.
Rd 3: Multiply one dc  at each one st (less two) = 30 dc 
Rd 4: Group of 3x dc in the same loop at each 2 st. with ch 1 between. Total 15 groups of 3dc.
Rd 5: Multiply one groups of 3dc (at each 3 groups) with ch one space between Total = 20 groups of 3dc.
Rd 6 to 9  work normal the 20 groups of 3dc,no multiply.
Rd 10 to 16: 3xTR ,with ch 1 space, the same for another 4 rounds.No multiply
Rd 17: Hdc each stitch
Always finish each round with slip stich ,and start the next round with ch 2.