factorial4

(n/m)!

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <apply>
    <csymbol cd="integer1">factorial</csymbol>
    <apply>
      <csymbol cd="arith1">divide</csymbol>
      <ci>n</ci>
      <ci>m</ci>
    </apply>
  </apply>
</math>

Author: Design Science, Inc. (D. Doyle, R. Miner)