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Search: id:A035088
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| A035088 |
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Number of labeled polygonal cacti (Husimi graphs) with n nodes. |
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+0
4
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| 1, 1, 0, 1, 3, 27, 240, 2985, 42840, 731745, 14243040, 313570845, 7683984000, 207685374435, 6135743053440, 196754537704725, 6805907485977600, 252620143716765825
(list; graph; listen)
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OFFSET
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0,5
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REFERENCES
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F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Camb. 1998, p. 301.
F. Harary and R. Z. Norman "The Dissimilarity Characteristic of Husimi Trees" Annals of Mathematics, 58 1953, pp. 134-141
F. Harary and E. M. Palmer, Graphical Enumeration, p. 71
F. Harary and G. E. Uhlenbeck "On the Number of Husimi Trees" Proc. Nat. Acad. Sci. USA vol. 39 pp. 315-322 1953
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LINKS
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Index entries for sequences related to cacti
Index entries for sequences related to trees
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FORMULA
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A035087/n, n>0.
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CROSSREFS
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Cf. A035082-A035087.
Sequence in context: A087426 A083713 A065100 this_sequence A013708 A102518 A074117
Adjacent sequences: A035085 A035086 A035087 this_sequence A035089 A035090 A035091
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KEYWORD
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nonn,nice
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Nov 15 1998
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