The Number of Crossings in a Regular Drawing of the Complete Bipartite Graph
Stéphane Legendre
Team of Mathematical Eco-Evolution
Ecole Normale Supérieure
75005 Paris 
France
Abstract:
The regular drawing of the complete bipartite graph 
Kn,n produces
a striking pattern comprising simple and multiple crossings. We compute
the number c(n)
of crossings and give an asymptotic estimate for this
sequence.
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(Concerned with sequences
A000537
A115004
A159065.)
Received April 20 2009;
revised version received July 10 2009.
Published in Journal of Integer Sequences, July 10 2009.
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