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A178453
Numerator of n!*Sum((-1)^k/k!, k=0..n)/(n-1)^n.
1
1, 1, 1, 11, 53, 103, 2119, 16687, 16481, 1468457, 1456321, 63633137, 2467007773, 34361893981, 171045872261, 8178130767479, 138547156531409, 92079694567171, 47106033220679059, 939765362752547227, 6563440628747948887, 39299278806015611311, 9923922230666898717143, 79253545592131482810517, 5934505493938805432851513, 154068892631103602583645049, 461572649528573755888451011, 116167945043852116348068366947, 3364864615063302680426807870189
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
See A178454 for denominators.
Sequence in context: A004622 A045471 A086715 * A225582 A164580 A141893
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Dec 22 2010
STATUS
approved