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A129425
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Number of isomorphism classes of connected 8-regular loopless multigraphs of order n.
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9
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0, 1, 1, 9, 36, 571, 12465, 543116, 35241608, 3230417239, 397514307014, 63830872225605, 13080448625309965, 3358687593761378470, 1063838242661288090062, 410057057694777406364151, 190064879184725871853627854, 104825763290631293396894238206
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OFFSET
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1,4
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COMMENTS
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Initial terms computed using software at http://users.cecs.anu.edu.au/~bdm/nauty/
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LINKS
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Table of n, a(n) for n=1..18.
Brendan McKay and Adolfo Piperno, Nauty and Traces
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FORMULA
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Inverse Euler transform of A129426. - Andrew Howroyd, Mar 17 2020
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PROG
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(nauty/bash) geng -c -d1 ${n} -q | multig -r8 -u # Natan Arie Consigli, Jun 05 2017
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CROSSREFS
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Column k=8 of A328682.
Cf. A129426, A129436, A000421, A129417, A129419, A129421, A129423, A328682.
Sequence in context: A204513 A223306 A272890 * A246757 A079655 A203764
Adjacent sequences: A129422 A129423 A129424 * A129426 A129427 A129428
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KEYWORD
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nonn
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AUTHOR
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Brendan McKay, Apr 15 2007
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EXTENSIONS
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Deleted a(0) and a(1). - N. J. A. Sloane, Jan 11 2020
a(1)=0 prepended and a(12)-a(18) from Andrew Howroyd, Mar 17 2020
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STATUS
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approved
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