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Search: id:A063682
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| A063682 |
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Number of 2-trees rooted at an asymmetric end-edge. |
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+0
1
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| 0, 1, 3, 13, 52, 229, 1024, 4749, 22454, 108299, 529896, 2625903, 13148268, 66428383, 338197609, 1733399552, 8936746984, 46315049443, 241146306914, 1260805087503, 6616786338256, 34843842405490, 184057255372576
(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. 75, Eq. (3.5.4).
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CROSSREFS
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Cf. A058870, A058866, A054581.
Sequence in context: A037772 A037660 A122600 this_sequence A082376 A065059 A072197
Adjacent sequences: A063679 A063680 A063681 this_sequence A063683 A063684 A063685
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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), Aug 22 2001
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