[r-t] Extents of minor

Chris Poole poole at maths.ox.ac.uk
Wed Aug 18 09:40:42 UTC 2004

> Simple question: how many extents of minor are there?
> Obviously, there are 720! ways of arranging the rows, but the vast majority
> of these will include jump changes.
> The maths required to produce the reduced list of true extents are somewhat
> beyond me....
> Percy

Let's not stop at minor and be a bit more general... what is the number of
extents on stage n?  (there must be a graph theorist out there somewhere!)


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