### Matrix for z(7,7 | Δ_2 ∪ {O})

1 | 1 | 1 | 2 | 2 | 2 | |

1 | 2 | 2 | 1 | 1 | 2 | |

1 | 2 | 2 | 2 | 1 | 1 | |

2 | 1 | 2 | 1 | 2 | 1 | |

1 | 2 | 2 | 1 | 2 | 1 | |

2 | 2 | 1 | 1 | 2 | 1 | |

2 | 1 | 2 | 1 | 1 | 2 |

Found by hand; matches the upper bound given by z(7,7)${} \cdot 2$.

Related: Matrix 2172

1 | 1 | 1 | 2 | 2 | 2 | |

1 | 2 | 2 | 1 | 1 | 2 | |

1 | 2 | 2 | 2 | 1 | 1 | |

2 | 1 | 2 | 1 | 2 | 1 | |

1 | 2 | 2 | 1 | 2 | 1 | |

2 | 2 | 1 | 1 | 2 | 1 | |

2 | 1 | 2 | 1 | 1 | 2 |

Found by hand; matches the upper bound given by z(7,7)${} \cdot 2$.

Related: Matrix 2172