# How to find the numbers of different perfect covers?

Find the number of different perfect covers of a 4-by-4 chessboard by dominos.

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en.wikipedia.org/wiki/Domino_tiling –  deinst Nov 24 '11 at 16:59
@deinst, that looks more like an answer than a comment. –  Gerry Myerson Nov 24 '11 at 23:37