Magic squares of type n-by-n

I wrote a small program that can generate a magic square for any size of a matrix. The idea is that this program can support me in my quest to generate some particular normal magic squares. The ideas I got thus far were too computationally intensive though. It remains an interesting enough playground for me, a challenging enough problem that I might solve one day. - I have read that you need some sort of portfolio of problems on which you can work alternately depending on how you feel, think, etc. on a given moment.

$$\left( \begin{array}{ccc} 9 & 6 & 3 \\ 0 & 6 & 12 \\ 9 & 6 & 3 \end{array} \right)$$
$$\left( \begin{array}{cccc} 9 & 6 & -1 & -4 \\ 5 & -6 & 3 & 8 \\ -8 & 7 & 6 & 5 \\ 4 & 3 & 2 & 1 \end{array} \right)$$
$$\left( \begin{array}{ccccc} 40 & 30 & -46 & 8 & -2 \\ 40 & -43 & 30 & -11 & 14 \\ -52 & 26 & 24 & 22 & 10 \\ -8 & 9 & 16 & 7 & 6 \\ 10 & 8 & 6 & 4 & 2 \end{array} \right)$$
$$\left( \begin{array}{cccccc} 165 & 118 & -86 & -79 & -59 & -38 \\ 84 & -187 & 48 & 46 & 8 & 22 \\ -113 & 42 & 20 & 19 & 36 & 17 \\ -78 & 32 & 15 & 14 & 26 & 12 \\ -43 & 11 & 20 & 18 & 8 & 7 \\ 6 & 5 & 4 & 3 & 2 & 1 \end{array} \right)$$
$$\left( \begin{array}{ccccccc} 344 & 272 & -144 & -180 & -124 & -66 & -46 \\ 228 & -391 & 70 & 68 & 66 & -17 & 32 \\ -202 & 62 & 30 & 58 & 28 & 54 & 26 \\ -194 & 50 & 48 & 46 & 44 & 42 & 20 \\ -94 & 38 & 18 & 34 & 16 & 30 & 14 \\ -40 & 13 & 24 & 22 & 20 & 9 & 8 \\ 14 & 12 & 10 & 8 & 6 & 4 & 2 \end{array} \right)$$
$$\left( \begin{array}{cccccccc} 795 & 644 & -283 & -272 & -261 & -250 & -213 & -124 \\ 493 & -890 & 96 & 94 & 92 & 90 & 17 & 44 \\ -406 & 86 & 42 & 82 & 80 & 39 & 76 & 37 \\ -329 & 72 & 70 & 34 & 33 & 64 & 62 & 30 \\ -252 & 58 & 56 & 27 & 26 & 50 & 48 & 23 \\ -175 & 44 & 21 & 40 & 38 & 18 & 34 & 16 \\ -98 & 15 & 28 & 26 & 24 & 22 & 10 & 9 \\ 8 & 7 & 6 & 5 & 4 & 3 & 2 & 1 \end{array} \right)$$