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A027405 Number of labeled servers of dimension 18. 1
1, 18, 477, 15726, 608499, 26775630, 1312423155, 70609087530, 4123848816585, 259217370402930, 17415882628886925, 1243604250827128350, 93931364648982616875, 7474399697415548199150, 624407709783640239540675 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

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..18 ) ).

MATHEMATICA

Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 18}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Jan 01 2013 *)

CROSSREFS

Sequence in context: A084273 A230587 A281161 * A282477 A116176 A035023

Adjacent sequences:  A027402 A027403 A027404 * A027406 A027407 A027408

KEYWORD

nonn

AUTHOR

Olivier Gérard

STATUS

approved

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Last modified February 22 18:03 EST 2020. Contains 332148 sequences. (Running on oeis4.)