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Search: id:A003026
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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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+0
6
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| 1, 9, 198, 10710, 1384335, 416990763, 286992935964, 444374705175516, 1528973599758889005, 11573608032229769067465, 191141381932394665770442818, 6839625961762363728765713227698
(list; graph; listen)
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OFFSET
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2,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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.
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CROSSREFS
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Cf. A058876, A003025.
Sequence in context: A110807 A019566 A157563 this_sequence A157594 A064756 A093708
Adjacent sequences: A003023 A003024 A003025 this_sequence 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 (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 10 2001
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