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A027396
Number of labeled servers of dimension 9.
1
1, 9, 117, 1869, 34749, 730053, 16995897, 432358641, 11893539177, 350916266097, 11032530974829, 367608423899781, 12923308003116933, 477498557451291021, 18481768753740402321, 747199095434993029257
OFFSET
0,2
LINKS
R. Donaghey, Binomial self-inverse sequences and tangent coefficients, J. Combin. Theory, Series A, 21 (1976), 155-163.
FORMULA
E.g.f.: exp( sum( ((1+x)^i-1)/i, i=1..9 ) ).
MATHEMATICA
Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 9}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Dec 31 2012 *)
CROSSREFS
Sequence in context: A346769 A304184 A255521 * A294190 A113344 A305968
KEYWORD
nonn
STATUS
approved