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A052756
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E.g.f.: (-1/3)*LambertW(-3*x).
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4
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0, 1, 6, 81, 1728, 50625, 1889568, 85766121, 4586471424, 282429536481, 19683000000000, 1531578985264449, 131621703842267136, 12381557655576425121, 1265437718438866624512, 139628860198736572265625, 16543163447903718821855232, 2094704750199298376445300801
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OFFSET
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0,3
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COMMENTS
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Previous name was: A simple grammar.
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LINKS
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FORMULA
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E.g.f.: (-1/3)*LambertW(-3*x).
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MAPLE
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spec := [S, {S=Prod(B, B, B, Z), B=Set(S)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[-1/3 LambertW[-3x], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Jun 01 2013 *)
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PROG
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(PARI) x='x+O('x^50); concat([0], Vec(serlaplace((-1/3)*lambertw(-3*x)))) \\ G. C. Greubel, Nov 05 2017
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CROSSREFS
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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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EXTENSIONS
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STATUS
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approved
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