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A007084
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Number of unlabeled trivalent 3-connected bipartite planar graphs with 2n nodes without subgraphs R2 and R4.
(Formerly M3255)
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1
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0, 0, 0, 0, 1, 1, 1, 4, 5, 14, 28, 86, 211, 648, 1878, 5931, 18326, 58746, 187620, 608065, 1975191, 6461809, 21212414
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OFFSET
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2,8
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COMMENTS
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The graphs R2 and R4 are given on p. 281 of Holton. - Sean A. Irvine, Oct 09 2017
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REFERENCES
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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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Table of n, a(n) for n=2..24.
D. A. Holton et al., Hamiltonian cycles in cubic 3-connected bipartite planar graphs, J. Combin. Theory, B 38 (1985), 279-297.
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CROSSREFS
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Cf. A007083.
Sequence in context: A241863 A350527 A316415 * A216243 A093862 A041375
Adjacent sequences: A007081 A007082 A007083 * A007085 A007086 A007087
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Mira Bernstein
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EXTENSIONS
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Title improved, a(17) corrected and a(20)-a(24) from Sean A. Irvine, Oct 09 2017
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STATUS
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approved
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