cff-version: 1.2.0
message: If you use results from this problem page, please cite it as below.
title: "Cairn Commons — Hadamard matrices of open orders"
type: dataset
license: CC-BY-4.0
url: "https://cairn-commons.com/problems/hadamard-open-orders"
date-released: 2026-09-29
authors:
  - name: Cairn Commons contributors
keywords:
  - "combinatorics"
  - "hadamard-conjecture"
  - "constructions"
  - "search"