OFFSET
1,3
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 476.
EXAMPLE
0, 1/12, 5/18, 19/32, 389/375, 1045/648, 78077/33614, ...
MAPLE
J := proc(n) option remember; local i; if n <= 1 then 0 else (n!/(8*(n+1)*n^(n-2))) * add( n^k/k!, k=0..n) -n^2/(4*(n+1)) +(1/(n+1))*add( binomial(n, i)*(i/n)^i*( (n-i)/n)^(n-i-1)*J(i), i=1..n-1); fi; end;
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Aug 02 2003
STATUS
approved