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A083411
a(n) = Sum(((k-1)/2)*k!*Stirling_2(n,k),k=1..n).
3
0, 1, 9, 79, 765, 8311, 100989, 1362439, 20246445, 328972471, 5805917469, 110645911399, 2265191981325, 49589790516631, 1156201277261949, 28605950745797959, 748605590542359405, 20661245832389468791, 599820758571599742429, 18272940402442730318119, 582867486201919540724685
OFFSET
1,3
FORMULA
E.g.f.: (1/2)*( (1-exp(x))/(2-exp(x)) )^2.
CROSSREFS
Equals A083384(n)/n.
Sequence in context: A163445 A190979 A254598 * A181279 A173808 A348895
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 08 2003
STATUS
approved