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A325474
Number of connected n-regular loopless multigraphs on eight unlabeled nodes.
3
0, 0, 1, 20, 204, 1689, 13303, 90614, 543116, 2842431, 13218770, 55233883, 210199115, 736166006, 2395665563, 7301022565, 20981692199, 57188601747, 148588072319, 369611918382, 883579452509, 2036672785494, 4539872512172, 9811474182969, 20605911433906, 42141179374995
OFFSET
0,4
COMMENTS
Multigraphs are loopless.
Initial terms computed using 'Nauty and Traces' (see the link).
LINKS
Brendan McKay and Adolfo Piperno, Nauty and Traces
PROG
(nauty/shell) for ((n=0; n<11; n++)); do geng -c -d1 8 -q | multig -r${n} -u; done
CROSSREFS
Row n=8 of A328682.
Sequence in context: A302838 A302921 A334692 * A364651 A133070 A135179
KEYWORD
nonn,hard
AUTHOR
Natan Arie Consigli, Aug 09 2019
EXTENSIONS
Terms a(13) and beyond from Andrew Howroyd, Mar 17 2020
STATUS
approved