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A324264
Number of connected graphs on n unlabeled nodes with diameter equal to radius.
1
1, 1, 1, 2, 5, 28, 223, 3151, 79673, 3853870
OFFSET
1,4
COMMENTS
When the graph diameter is equal to the radius, every node has the same eccentricity and is in both the graph center and the graph periphery.
LINKS
Eric Weisstein's World of Mathematics, Graph Center
Eric Weisstein's World of Mathematics, Graph Periphery
CROSSREFS
Rightmost diagonal of A294525 and A324244.
Sequence in context: A009635 A216401 A342288 * A138293 A316972 A068069
KEYWORD
nonn,more
AUTHOR
Andrew Howroyd, Sep 02 2019
STATUS
approved