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Search: id:A063688
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| A063688 |
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Number of 2-trees rooted at a triangle. |
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+0
1
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| 1, 1, 3, 10, 39, 164, 746, 3474, 16658, 81166, 401169, 2004517, 10110757, 51402250, 263133142, 1355126922, 7016115632, 36498130908, 190673015083, 999932115039, 5262094054524, 27779114013628, 147072756065567, 780722981065006
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 76, Eq. (3.5.13).
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CROSSREFS
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Cf. A005750, A058870, A058866, A054581.
Sequence in context: A063022 A151072 A151073 this_sequence A083862 A137590 A124532
Adjacent sequences: A063685 A063686 A063687 this_sequence A063689 A063690 A063691
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 22 2001
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