<?xml version='1.0'?>
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.1 plus MathML 2.0//EN'
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<html xmlns='http://www.w3.org/1999/xhtml'>
<head><title>polygamma8</title>
<!-- MathML created with MathCast Equation Editor version 0.89 -->
</head>
<body>
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <msup>
      <mi>&#x03C8;</mi>
      <mfenced>
        <mrow>
          <mi>n</mi>
        </mrow>
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    </msup>
    <mfenced>
      <mrow>
        <mn>1</mn>
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    </mfenced>
    <mo>=</mo>
    <msup>
      <mfenced>
        <mrow>
          <mo>&#x2212;</mo>
          <mn>1</mn>
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      </mfenced>
      <mrow>
        <mi>n</mi>
        <mo>+</mo>
        <mn>1</mn>
      </mrow>
    </msup>
    <mi>n</mi>
    <mo>!</mo>
    <mi>&#x03C2;</mi>
    <mfenced>
      <mrow>
        <mi>n</mi>
        <mo>+</mo>
        <mn>1</mn>
      </mrow>
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</math>
</body>
</html>