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A005028
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Number of symmetric trivalent maps with n nodes.
(Formerly M1257)
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5
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1, 2, 4, 12, 33, 102, 312, 1010, 3256, 10836, 36094, 122544, 417150, 1437712, 4970904, 17333772, 60638124, 213435264, 753520804, 2672606464, 9505230397, 33928264990, 121400935184, 435660446342, 1566809204928, 5648450745204, 20402191885146, 73842311224632
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OFFSET
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3,2
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REFERENCES
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C. F. Earl and L. J. March, Architectural applications of graph theory, pp. 327-355 of R. J. Wilson and L. W. Beineke, editors, Applications of Graph Theory. Academic Press, NY, 1979.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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CROSSREFS
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Antidiagonal sums of the array in A169809.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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