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A052764
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A simple grammar.
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2
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0, 1, 8, 144, 4096, 160000, 7962624, 481890304, 34359738368, 2821109907456, 262144000000000, 27197360938418176, 3116402981210161152, 390877006486250192896, 53265296773103187132416
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..14.
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 721
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FORMULA
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E.g.f.: -1/4*LambertW(-4*x)
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MAPLE
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spec := [S, {B=Set(S), S=Prod(Z, B, B, B, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A134492 A067421 A124059 * A024284 A024285 A111687
Adjacent sequences: A052761 A052762 A052763 * A052765 A052766 A052767
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KEYWORD
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easy,nonn
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AUTHOR
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encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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STATUS
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approved
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