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You can try :

    Mat a(6, 6, CV_8UC3, Scalar(1, 64, 192));
    vector<vector<uchar>> v(a.rows);
    for (int i = 0; i < a.rows; i++)
    {
        a.row(i).reshape(1,1).copyTo(v[i]);
    }
    for (int i = 0; i < a.rows; i++)
    {
        for (auto j : v[i])
            cout << int(j) << "\t";
        cout << "\n";
    }