5 4 3 2
with A(n) := 126392 n + 412708 n + 531578 n + 336367 n + 104000 n + 12463
given by Theodor Amdeberhan and Doron Zeilberger (see [1]).

References:
===========

[1] T. Amdeberhan und D. Zeilberger: Hypergeometric Series Acceleration via
the WZ Method, Electronic Journal of Combinatorics (Wilf Festschrift
Volume) 4 (1997).

[2] B. Haible, T. Papanikolaou: Fast multiprecision evaluation of series of
rational numbers, Technical Report TI-97-7, Darmstadt University of
Technology, April 1997.

[3] S. Wedeniwski: Piologie - Eine exakte arithmetische Bibliothek in C++,
Technical Report WSI 96-35, Tuebingen University, available by anonymous
ftp from "ftp://ftp.informatik.uni-tuebingen.de/pub/CA/software/Piologie/"
or "ftp://ruediger.informatik.uni-tuebingen.de/Piologie/".


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