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A027408
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Number of labeled servers of dimension 21.
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1
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1, 21, 651, 25151, 1141791, 58999227, 3398446177, 215000489757, 14773746912897, 1093126139653877, 86488314164428659, 7275617735214635079, 647633785826931486079, 60753264284081214177339
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OFFSET
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0,2
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REFERENCES
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R. Donaghey, Binomial self-inverse sequences and tangent coefficients, J. Combin. Theory, Series A, 21 (1976), 155-163.
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..200
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FORMULA
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E.g.f.: exp( sum( ((1+x)^i-1)/i, i=1..21 ) ).
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MATHEMATICA
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Table[n!*SeriesCoefficient[E^(Sum[((1+x)^i - 1)/i, {i, 1, 21}]), {x, 0, n}], {n, 0, 20}] (* Vincenzo Librandi, Jan 01 2013 *)
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CROSSREFS
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Sequence in context: A163032 A209264 A012501 * A177840 A158216 A020246
Adjacent sequences: A027405 A027406 A027407 * A027409 A027410 A027411
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KEYWORD
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nonn
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AUTHOR
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Olivier Gérard
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STATUS
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approved
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