Only a couple of bimagic squares of order 11 by Fredrik Jansson and Chen Mu-tian were known for a long time. But in 2018 Walter Trump and Holger Danielsson created 129 new and different bimagic squares.
From all squares you can create other bimagic squares by applying row-column-transformations.
|Author||Fredrik Jansson (2004)|
|Chen Mu-tian (2005)|
|Walter Trump – Holger Danielsson (2018)|
All algorithms are described in detail in chapter Bimagic Squares (german: Bimagische Quadrate) together with some other PDF documents.