Cube somme des impaires language C

#include <stdio.h>

int main()
{
    int n,i;
    printf("entrer n");
    scanf("%d",n);
    for (i=(n*n-n+1);i<(n*n+n-1);i=i+2)
    {
        printf("%d",i);
    }
}

#include <stdio.h>

int main()
{
    int i,n,d;
    printf("entrer n");
    scanf("%d",n);
    for (i=0,d=0;i<n;i++)
    {
        d=d+i;
    }
    printf("%d = ",n*n*n);
    for (i=1,d=2*d;i<n;i++)
    {
       printf("%d + ",d+2*i);
    }
    printf("%d",d+2*n);
}