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/usr/share/xscreensaver/config/sierpinski3d.xml is in xscreensaver-gl-extra 5.15-3ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="sierpinski3d" _label="Sierpinski3D">

  <command arg="-root"/>

  <number id="delay" type="slider" arg="-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="20000"
          convert="invert"/>

  <number id="descent" type="slider" arg="-speed %"
          _label="Duration" _low-label="Short" _high-label="Long"
          low="2" high="500" default="150"
          convert="invert"/>

  <number id="depth" type="spinbutton" arg="-depth %"
          _label="Max depth" low="1" high="6" default="5"/>

  <boolean id="wire"    _label="Wireframe"              arg-set="-wireframe"/>
  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
This draws the Sierpinski tetrahedron fractal, the three-dimensional
variant of the recursive Sierpinski triangle.

http://en.wikipedia.org/wiki/Sierpinski_triangle#Analogs_in_higher_dimension

Written by Jamie Zawinski and Tim Robinson; 1999.
  </_description>
</screensaver>