[seqfan] Re: wording for digraphs A053763

[Brendan McKay]

Yes, definitely labeled SIMPLE digraphs.   Brendan.

    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