OFFSET

1,2

COMMENTS

This count includes equivalent matrices.

LINKS

Minfeng Wang, C++ program to calculate A051753

Eric Weisstein's World of Mathematics, Hadamard's Maximum Determinant Problem

Eric Weisstein's World of Mathematics, (-1, 0, 1)-Matrix

CROSSREFS

KEYWORD

nonn,more

AUTHOR

EXTENSIONS

a(4) from Jud McCranie, Oct 15 2000

a(5) from Giovanni Resta, Feb 20 2009

a(1)-a(5) confirmed and a(6) added by Minfeng Wang, May 29 2024

STATUS

approved