Pandiagonal:   odd order n=3·k

Not so far away, everybody believes that there are no pandiagonal magic squares of odd order, where the order is a multiple of 3 (9, 15, 21, ...). This "fact" was even proven by Tarry. But nowadays the situation has changed, because we know a lot of algorithms to produce such pandiagonal magic squares. Even the computer can do this.

Method
Bouteloup
Candy   (pandiagonal subsquares)
CandyCandy   (Method 2)
CandyCandy   (Method 3)
Hendricks
Margossian
Planck

All algorithms are described in detail in chapter Pandiagonal Magic Squares (german: Pandiagonale magische Quadrate) together with some other PDF documents.