Six Little Squares and How Their Numbers Grow

Details Six Little Squares and How Their Numbers Grow Six Little Squares and How Their Numbers Grow

2010-04-02

arxiv.org/abs/1004.0282v2

Journal of Integer Sequences 13 (2010), Article 10.6.2

Mathematics

Combinatorics

39 pages

Scientific paper

We find the numbers of $3 \times 3$ magic, semimagic, and magilatin squares, as functions either of the magic sum or of an upper bound on the entries in the square. Our results on magic and semimagic squares differ from previous ones in that we require the entries in the square to be distinct from each other and we derive our results not by \emph{ad hoc} reasoning but from the general geometric and algebraic method of our paper "An enumerative geometry for magic and magilatin labellings". Here we illustrate that method with a detailed analysis of $3\times3$ squares.

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