Strachey method for magic squares

The Strachey method for magic squares is an algorithm for generating magic squares of order 4n+2.

Example of magic square of order 6 constructed with the Strachey method:

 example
35  	1  	6  	26  	19  	24
3 	32 	7 	21 	23 	25
31 	9 	2 	22 	27 	20
8 	28 	33 	17 	10 	15
30 	5 	34 	12 	14 	16
4 	36 	29 	13 	18 	11