Try:

std::vector<int> row(n + 1);
 
  row[0] = 1;
  for (int j = 1; j <= n; j++)
    for (int i = j; i; row[i] += row[i - 1], i--);
 
  return row;

Though depending on what you're doing with the data, you may want to just write the results to screen.