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A005028 Number of symmetric trivalent maps with n nodes.
(Formerly M1257)
2
1, 2, 4, 12, 33, 102, 312, 1010 (list; graph; refs; listen; history; internal format)
OFFSET

3,2

REFERENCES

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).

CROSSREFS

Antidiagonal sums of the array in A169809.

Sequence in context: A027695 A148195 A169807 * A148196 A148197 A148198

Adjacent sequences:  A005025 A005026 A005027 * A005029 A005030 A005031

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 17 10:57 EST 2012. Contains 206009 sequences.