程序代码：

#include <stdio.h>

int getValueOfIndex(int n, int row, int col)
{
    int start, lap, offset, tmp;
    n--;
    lap = (row <= col) ? row : col;
    tmp = n - row - col;
    if(tmp < lap) lap = tmp;
    start = 3 * n * lap - 9 * lap * (lap - 1) / 2;
    tmp = n - 3 * lap;
    row -= lap;
    col -= lap;
    if(row == 0) offset = col;
    else if(col == 0) offset = tmp * 3 - row;
    else offset = tmp * 2 - col;
    return start + offset + 1;
}

int main()
{
    int n, i, j;
    scanf("%d", &n);
    for(i = 0; i < n; i++)
    {
        for(j = 0; j < n - i; j++)
            printf("%-4d", getValueOfIndex(n, i, j));
        printf("\n");
    }
    return 0;
}