[seqfan] Re: Wiener index of n X k grid

Richard Mathar mathar at strw.leidenuniv.nl
Sun Jan 22 13:24:52 CET 2012

http://list.seqfan.eu/pipermail/seqfan/2012-January/016287.html says

ej> Finally, the current version of A143368 gives (if I'm not mistaken) the
ej> triangle
ej> 0
ej> 1,8
ej> 4,25,72
ej> ...
ej> which is clearly incorrect: for example, it can be shown that the Wiener
ej> index for a n X 1 grid (n>=1) is given by the sequence {1,8,25,...}, which
ej> is column 1 of the proposed corrected version of the triangle.

Emeric's terms are correct. I've added more examples to A143368 to illustrate 
this point.


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