[seqfan] Displaying an o.g.f for binomial(mn,n)
Thomas Copeland
tccopeland at gmail.com
Fri May 25 13:34:05 CEST 2012
Dear OEIS editors,
Could someone please show me how to format the LaTeX expression below
acceptably for the OEIS?
It represents an apparent o.g.f. (z>=0) for the sequence
binomial(4n,n), A005810. (It's integral is related to the associated
Fuss-Catalan/Raney sequence A002293.) I'd like to submit similar
expressions for binomial(mn,n) for m=2,3, ....
Please paste the following expression in the LaTeX editor at
http://www.codecogs.com/latex/eqneditor.php to display it:
o.g.f.(z^3)=\frac{1}{2\sqrt\Delta}\sum_{i= 1}^{4}\prod_{j,k\neq
i,j<k}^{4}|x_j-x_k|
where the x_k are the four zeros for x^4-x+z=0 and delta is the
discriminant |256-27z^3|^(1/2).
Sincerely,
Tom Copeland
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