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Search: id:A060337
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| A060337 |
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Number of labeled acyclic digraphs with n nodes containing exactly n-2 points of in-degree zero. |
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+0
1
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| 15, 198, 1610, 10575, 61845, 336924, 1751076, 8801325, 43141175, 207347778, 980828238, 4578689115, 21135851625, 96628899960, 438068838536, 1971349880985, 8813183238315, 39169902510270, 173172640973010
(list; graph; listen)
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OFFSET
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3,1
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REFERENCES
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F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 19, (1.6.4).
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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Third column of A058876, Cf. A003025, A003026.
Sequence in context: A015673 A125472 A098300 this_sequence A078264 A014896 A048444
Adjacent sequences: A060334 A060335 A060336 this_sequence A060338 A060339 A060340
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 10 2001
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