R1: start with 4 sc in the magic ring, 1 ss.
R2: 1 ch, (2 sc in next st)* 4 times, 1 ss.
R3: 1 ch, 1 sc, 2 sc in next st, 3 sc, 2 sc in next st, 2 sc, 1 ss.
R4: 1 ch, 10 sc, 1 ss.
R5: 1 ch, 2 sc, 2 sc in next st, 4 sc, 2 sc in next st, 2 sc, 1 ss.
R6: 1 ch, 12 sc, 1 ss.
R7: 1 ch, 2 sc, 2 sc in next st, 5 sc, 2 sc in next st, 3 sc, 1 ss.
R8: 1 ch, 14 sc, 1 ss.
R9: 1 ch, 3 sc, 2 sc in next st, 6 sc, 2 sc in next st, 3 sc, 1 ss.
R10: 1 ch, 16 sc, 1 ss.
R11: 1 ch, 3 sc, 2 sc in next st, 7 sc, 2 sc in next st, 4 sc, 1 ss.
R12: 1 ch, 18 sc, 1 ss.
R13: 1 ch, 4 sc, 2 sc in next st, 8 sc, 2 sc in next st, 4 sc, 1 ss.
R14: 1 ch, 20 sc, 1 ss.
R15: 1 ch, 4 sc, 2 sc in next st, 9 sc, 2 sc in next st, 5 sc, 1 ss.
R16: 1 ch, 22 sc, 1 ss.
R17: 1 ch, 5 sc, 2 sc in next st, 10 sc, 2 sc in next st, 5 sc, 1 ss.
R18: 1 ch, 24 sc, 1 ss.
R19: 1 ch, 5 sc, 2 sc in next st, 11 sc, 2 sc in next st, 6 sc, 1 ss.
R20: 1 ch, 26 sc.