[seqfan] Re: wording for digraphs A053763

[Neil Sloane]

Richard, Thanks for the suggestion. I made some edits to the sequences in
question (A053763, A002416).


On Sun, May 18, 2014 at 10:10 AM, Richard J. Mathar
<mathar at mpia-hd.mpg.de>wrote:

> Should the first comment in http://oeis.org/A053763 be changed to
> "... labeled simple..", because the labeled digraphs (without multi-edges)
> are
> actually counted in A002416?
> My naive thinking is that there is a 1-to-1 map of the (0,1) nXn matrices
> onto labelled graphs on n vertices. Taking the 2^(n^2) different (0,1)
> matrices and then forcing the n diagonal elements to be zero (where
> the loops are registered in the adjacency matrix), the
> number of independent elements in the matrix shrinks from n^2 to n^2-n...
>
> Richard Mathar
>
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Neil J. A. Sloane, President, OEIS Foundation
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