Paper by Guy Begin?

[Hugo Pfoertner]

Henry Gould wrote:
> 
> Does anyone know anything about the following paper that my students and
> I have tried to find by interlibrary loan seevice here at West Virgin ia
> University?
> 
> ***Dear Henry Gould,
> 
> A request you have placed:
> 
> TN: 147331
> Book/Journal Title: Sâeries formelles et combinatoire algâebrique : actes /
> Journal Info: 4th Colloquium       1992 1-10
> Author: G. Begin
> 
> has been cancelled by the Interlibrary Loan staff for the following reason:
> 
> We have exhausted all possible sources.
> 
> No library is able to supply this item.
> 
> National Library of Canada says:
> 
>               The requested paper was never published.  For more
>               information please contact the author: Guy Begin :
>               begin.guy at uqam.ca  Thank you for using interlibrary loan
> 
> This paper is referenced for Sequences A007223, A007224, A007225,
> A007226, A007227, A007228, and A007229. In particular in the OEIS under
> Sequernce A007226 we find the formula  a(n)=2*det(M(n,-1))/det(M(n, 0))
> where M(n,m) is the n X n matrix with
>               element 1/binomial(n+i+j+m,n).
> Attempts to find the referebced paper have failed. My students and I
> have tried to find the paper but it does not seem to exist. Help is
> needed. We need to find a proof of the cited formula.
> --Henry Gould

The table of contents (without Begin's paper) of the conference
proceedings is at

http://www.lacim.uqam.ca/Publications/11.html

A (German) report on the conference (English title: 4th Conference on
Formal Power Series and Algebraic Combinatorics) at

http://www.fachgruppe-computeralgebra.de/CAR/CAR11/node4.html

says, ("Poster: G. Begin: On the enumeration of perforation patterns for
punctured convolutional codes,....") that Guy Begin's contribution was
only given in a poster session. Maybe one of the conference paper
authors (James Propp) or Simon Plouffe, who presented the software
"gfun" can help. For contact info see 100k party page ;-)

Hugo Pfoertner