1,1

A matrix A is normal if A^T A = A A^T, where for this sequence multiplication is performed in the field of two elements.

Table of n, a(n) for n=1..8.

Eric Weisstein's World of Mathematics, Normal Matrix

Index entries for sequences related to binary matrices

A055547 counts 0-1 matrices normal over the integers.

Sequence in context: A230880 A214689 A202999 * A130530 A134529 A289897

Adjacent sequences: A308085 A308086 A308087 * A308089 A308090 A308091

nonn,hard,more

Brendan McKay, May 11 2019

approved