>>247
7x7, 6x7, 5x7, 4x7, 3x7, 2x7, 1x7
6x6, 5x6, 4x6, 3x6, 2x6, 1x6
5x5, 4x5, 3x5, 2x5, 1x5

だから規則性はあるのでは