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Search: id:A000421
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| A000421 |
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Number of isomorphism classes of connected 3-regular loopless multigraphs of order 2n. |
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+0
10
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| 1, 2, 6, 20, 91, 509, 3608, 31856, 340416, 4269971, 61133757, 978098997
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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A. T. Balaban, Enumeration of Cyclic Graphs, pp. 63-105 of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. Press, 1976; see p. 92.
CRC Handbook of Combinatorial Designs, 1996, p. 651.
Brendan McKay, software at http://cs.anu.edu.au/~bdm/nauty/
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CROSSREFS
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Cf. A129416, A005967, A129417, A129419, A129421, A129423, A129425
Sequence in context: A027321 A027315 A005965 this_sequence A009244 A104985 A079575
Adjacent sequences: A000418 A000419 A000420 this_sequence A000422 A000423 A000424
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Brendan McKay (bdm(at)cs.anu.edu.au), Apr 15 2007
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