Problem 44080. Construct a "diagAdiag" matrix

Construct a matrix whose elements begin from 1 and end at n^2 with the order of arrangement as shown below:

For:

n = 4

output

M = 
[1   2   6   7;
3   5   8   13;
4   9   12  14;
10  11  15  16]

Note the elements increase and decrease along alternating diagonals with the last element being always n^2.