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Search: id:A027439
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| A027439 |
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Expansion of 1/(1-4*x+5*x^2-3*x^3). |
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+0
1
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| 1, 4, 11, 27, 65, 158, 388, 957, 2362, 5827, 14369, 35427, 87344, 215348, 530953, 1309104, 3227695, 7958119, 19621313, 48377742, 119278760, 294090269, 725100502, 1787786943, 4407916069, 10868031067
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Number of ordered trees with n+3 edges having on each subtree of the root exactly one node with more than one descendant. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Dec 11 2007
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MAPLE
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G:=1/(1-4*x+5*x^2-3*x^3): Gser:=series(G, x=0, 30): seq(coeff(Gser, x, n), n=0.. 25); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Dec 11 2007
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CROSSREFS
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Sequence in context: A100335 A080869 A137229 this_sequence A108985 A014151 A096124
Adjacent sequences: A027436 A027437 A027438 this_sequence A027440 A027441 A027442
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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