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A003026
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Number of n-node acyclic digraphs with 2 out-points.
(Formerly M4666)
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5
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1, 9, 198, 10710, 1384335, 416990763, 286992935964, 444374705175516, 1528973599758889005, 11573608032229769067465, 191141381932394665770442818, 6839625961762363728765713227698
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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2,2
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REFERENCES
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R. W. Robinson, Counting labeled acyclic digraphs, pp. 239-273 of F. Harary, editor, New Directions in the Theory of Graphs. Academic Press, NY, 1973.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Table of n, a(n) for n=2..13.
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CROSSREFS
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Cf. A058876, A003025.
Sequence in context: A110807 A019566 A157563 * A157594 A196910 A064756
Adjacent sequences: A003023 A003024 A003025 * A003027 A003028 A003029
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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EXTENSIONS
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More terms from Vladeta Jovovic, Apr 10 2001
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STATUS
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approved
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