UnilateralDiscreteConvolve
UnilateralDiscreteConvolve[f, g, k, n] gives the unilateral discrete convolution with respect to k of the expressions f and g.
UnilateralDiscreteConvolve[f, g, {k1, ..., kp}, {n1, ..., np}]gives the multidimensional unilateral discrete convolution.
Examples
UnilateralDiscreteConvolve[a^k, b^k, k, n]UnilateralDiscreteConvolve[k, k^2, k, n]Please visit the official Wolfram Language Reference for more details.