A Hadamard matrix $H$ is a matrix with entries $\pm1$ and orthogonal columns.
Given that the matrix is nxn, I got that the determinant is $2^n\times4$. However, this is clearly not correct since the determinant of a $4\times4$ Hadamard Matrix is 16, but according to my answer it is 64.
This is how I derived my answer:
I got $\det(-2H^2)$ by noting that the determinant of block matrices is $\det(AD - BC)$.
Where am I going wrong?