ag-gipp/GoUldI

<math 
  xmlns='http://www.w3.org/1998/Math/MathML'>
  <semantics>
    <mrow>
      <mi>n</mi>
      <mo>&#63449;</mo>
      <mrow>
        <msubsup>
          <mi>x</mi>
          <mi>k</mi>
          <mn>2</mn>
        </msubsup>
        <mo>+</mo>
        <msubsup>
          <mi>x</mi>
          <mn>1</mn>
          <mn>2</mn>
        </msubsup>
        <mo>+</mo>
        <msubsup>
          <mi>x</mi>
          <mn>2</mn>
          <mn>2</mn>
        </msubsup>
        <mo>+</mo>
        <mo>&#8230;</mo>
      </mrow>
    </mrow>
    <annotation-xml encoding='MathML-Content'>
      <apply>
        <eq />
        <ci>n</ci>
        <apply>
          <plus />
          <apply>
            <power />
            <apply>
              <ci>Subscript</ci>
              <ci>x</ci>
              <ci>k</ci>
            </apply>
            <cn type='integer'>2</cn>
          </apply>
          <apply>
            <power />
            <apply>
              <ci>Subscript</ci>
              <ci>x</ci>
              <cn type='integer'>1</cn>
            </apply>
            <cn type='integer'>2</cn>
          </apply>
          <apply>
            <power />
            <apply>
              <ci>Subscript</ci>
              <ci>x</ci>
              <cn type='integer'>2</cn>
            </apply>
            <cn type='integer'>2</cn>
          </apply>
          <ci>&#8230;</ci>
        </apply>
      </apply>
    </annotation-xml>
  </semantics>
</math>