OFFSET
2,4
COMMENTS
The fraction is a lower bound on certain permanents.
REFERENCES
G. P. Egorychev, Van der Waerden conjecture and applications, pp. 3-26 in Handbook of Algebra, Vol. 1, ed. M. Hazewinkel, Elsevier, 1996.
EXAMPLE
1, 1/4, 1/9, 11/256, 53/3125, 103/15552, 2119/823543, 16687/16777216, 16481/43046721, ...
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Dec 22 2010
STATUS
approved