Doubled order (n even)

There are several methods, which can double the size of an existing magic square. With small changes, basic magic squares of odd and even order can be processed by these methods.

Method
Strachey (Benson-Jacoby Variant)
Benson - Jacoby
Bouteloup
Hendricks
Widdis - Richter
Chen Zhong-mu
Candy
Candy (Variant with d1)
Candy (Variant with d1 and d2)
Medjig
Order:  create