Table of cards (Base Atk * Base Hp)

Power = ceil[(Attack + Health / 3) / 2]=  ceil[( Attack *3 + Health) / 6]

  Power{20;60}=(23*3 +69)/6=23  

where ceil is the ceiling function (round up to nearest integer)

{ 23; 69}(20;60)=[(20+60) * 1,15] ) / 4]=20*1,15= 23