Diamond inlaid magic square is a very special magic square. It will have all odd numbers placed in the center in a Diamond shape and all even numbers distributed in four seperate triangular shape in the four corners.
In the above 21 x 21 diamond inlaid magic square, all the numbers from 1 to 441 are used. All the vertical, Horizontal and both diagonal totals are equal to 4641.
Surprisingly around the center number 221, all the diagonally opposite postioned numbers, and symetrically opposite positioned numbers will give a total of 442. There are 441 – 1 = 440 / 2 = 220. We can get it in 220 different methods.
I have done a 1999 x 1999 Diamond inlaid magic square in which all the numbers from 1 to 39,96,001 are used. All Horizontal, vertical and both diagonal totals will be 399,40,03,999. ( Three hundred ninty nine crores, forty lakhs, three thousand and nine hundred and ninety nine) or 3,994,003,999 ( Three Billion, 994 million, three thousand nine hundred and niniety nine)
Thanks to the Almighty for giving me the idea, guided me, till the final execution to make it a reality.