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A129416 Number of isomorphism classes of 3-regular loopless multigraphs of order 2n. 8
1, 3, 9, 32, 135, 709, 4637, 38374, 391473, 4764778, 66913591, 1056886475 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/

LINKS

Table of n, a(n) for n=1..12.

L. Travis, Graphical Enumeration: A Species-Theoretic Approach, Ph.D. thesis, Brandeis University, 1999, Section 4.3. arXiv:math/9811127.

CROSSREFS

Cf. A000421 (connected, inv. Eul. trans.), A129427, A129418, A129420, A129422, A129424, A129426

Sequence in context: A194530 A005964 A246138 * A210689 A273596 A009356

Adjacent sequences:  A129413 A129414 A129415 * A129417 A129418 A129419

KEYWORD

nonn

AUTHOR

Brendan McKay, Apr 15 2007

STATUS

approved

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Last modified June 17 15:28 EDT 2019. Contains 324194 sequences. (Running on oeis4.)