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Cutting Squares

Problem 270

Published on 26 December 2009 at 01:00 am [Server Time]

A square piece of paper with integer dimensions N×N is placed with a corner at the origin and two of its sides along the x- and y-axes. Then, we cut it up respecting the following rules:

  • We only make straight cuts between two points lying on different sides of the square, and having integer coordinates.
  • Two cuts cannot cross, but several cuts can meet at the same border point.
  • Proceed until no more legal cuts can be made.

Counting any reflections or rotations as distinct, we call C(N) the number of ways to cut an N×N square. For example, C(1) = 2 and C(2) = 30 (shown below).

What is C(30) mod 108 ?


Answer:
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