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Keywords: Walsh permutation 1 2 7.svg Permutation matrix of the Walsh permutation wp 1 2 7 1 2 7 is <big> </big> A001317 1 2 3 -1<big> </big>/2 The elements of this permutation are the even elements of wp 1 3 5 15 divided by 2 It is self-inverse so the matrix is symmetric Above that the matrix is also symmetric to the antidiagonal own mate2code Permutation matrices of Walsh permutations 3-bit Walsh permutation |