2D array help

[copper leaf]

cant seem to get my array to go like this with my nested for loop, tried everything i can think of
this is as far as ive gotten

                for (int i=0; i<=9; i++) {
                    for (int j=9-i ; j>=7-i; j--) {
                        if (j>=0)
                            m[i][j] = n++;
                    }
                }```

[late pewter]

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[copper leaf]

There is a difference of two on each number (3, 5, 7) in each row and a difference of three on each column (3, 6, 9)

except the first row with "1"

you can probably make use of that

[wheat elbow]

the array in the picture goes from top left to button right ?

[copper leaf]

technically doesnt matter, ive tried both ways with 1++ and 27--

[wheat elbow]

i just wanna know

.-.

but ok

[wheat elbow]

that was fun to make

int counter=1;
        int threeRow=usableLength+2;
        for(int j=usableLength;j>=0;j--){
            for(int i=threeRow;i>threeRow-3;i--){
                if(i<=usableLength && i>=0){
                    finalArray[i][j]=counter;
                    counter++;
                }
            }
            threeRow--;
        }

dont judge my crapy style :/