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\line{\bf CS 106 Final Project.\hfill}

A strip of paper ruled into four squares can be completely folded up
into one of the forms shown below.

\figbox 1in:

$$\hbox{2345\qquad\qquad\qquad
1243
\qquad\qquad 
\qquad
2314
\qquad\qquad 
\qquad
2143\qquad\qquad 
\qquad
1432}$$
The numbers show the sequence of levels as you go from one end of the paper to the
other. For paper strips of five, six, and seven squares, find how many ways
there are to fold the strip. Print pictures of the five-square folded strips.



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\copyright 1984 Robert W. Floyd

First draft October 26, 1984

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