Keywords: Walsh permutation 1 3 5 15.svg Permutation matrix of the Walsh permutation wp A001317 0 3 wp 1 3 5 15 <br> The permutation is row 2 of the triangle A197819 It is self-inverse so the matrix is symmetric The odd entries on the odd places are the complements of the even entries on their left <br> The subsequence of even entries divided by 2 gives wp A001317 1 2 3 -1 /2 wp 1 2 7 File Walsh permutation 1 2 7 svg The permutation is self-inverse so the matrix is symmetric Above that the matrix is also symmetric to the antidiagonal own mate2code Permutation matrices of 4-bit Walsh permutations |