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A027402 Number of labeled servers of dimension 15. 1
1, 15, 330, 9010, 288240, 10473072, 423446080, 18775484160, 903038514720, 46713885798880, 2581318186453824, 151514025671607360, 9402355792409835520, 614406453498776970240, 42132162349935136988160 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

R. Donaghey, Binomial self-inverse sequences and tangent coefficients, J. Combin. Theory, Series A, 21 (1976), 155-163.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

E.g.f.: exp( sum( ((1+x)^i-1)/i, i=1..15 ) ).

MATHEMATICA

Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 15}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Jan 01 2013 *)

CROSSREFS

Sequence in context: A180779 A196666 A025751 * A053104 A114937 A157965

Adjacent sequences:  A027399 A027400 A027401 * A027403 A027404 A027405

KEYWORD

nonn

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified April 18 07:04 EDT 2014. Contains 240706 sequences.