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A360868
Number of unlabeled connected loopless multigraphs with circuit rank n and degree >= 3 at each node.
2
0, 1, 4, 23, 172, 1848, 25684
OFFSET
1,3
FORMULA
a(n) = Sum_{k>=1} A360866(n + k - 1, k).
CROSSREFS
Diagonal sums of A360866.
Sequence in context: A317276 A113869 A084357 * A075729 A328006 A127131
KEYWORD
nonn,hard,more
AUTHOR
Andrew Howroyd, Feb 25 2023
STATUS
approved