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A129433
Number of isomorphism classes of 6-regular multigraphs of order n, loops allowed.
8
1, 4, 13, 66, 384, 3369, 40365, 675368, 14843787, 412444439, 14024069358, 570883006810, 27368160642418, 1525274952640101, 97766102550401217, 7141331463919539567, 589726897233157151109, 54669618693986578729541, 5653861386413841612952683, 648651469510725736002532451
OFFSET
1,2
COMMENTS
Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/
LINKS
R. C. Read, The enumeration of locally restricted graphs (I), J. London Math. Soc. 34 (1959) 417-436. [From Jason Kimberley, Oct 05 2009]
FORMULA
a(n) = N\{S_n[S_6] * S_{3n}[S_2]\}. [Equation (5.8) of Read 1959]
Euler transform of A129432. - Andrew Howroyd, Mar 15 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Brendan McKay, Apr 15 2007
EXTENSIONS
Using the formula, new terms a(13), Oct 05 2009, and a(14)-a(16), Nov 09 2009, were computed in MAGMA by Jason Kimberley
a(17)-a(20) from Andrew Howroyd, Mar 21 2020
STATUS
approved