How would i do a table of values for this equation: y=1/2(3)^-2x starting from -5 to 5

i get these values: -0.2778, -0.2222, -0.1667, -0.1111, -0.0556, 0 etc... ami wrong?

y(-5) = (1/2)(3^10) = 29524.5

You will get no negative values for any exponential.