A360031 - OEIS

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A360031

a(n) is the number of unlabeled 2-connected graphs with n edges containing at least one pair of nodes with resistance distance 1 when all edges are replaced by unit resistors.

1

0, 1, 1, 1, 2, 5, 14, 35, 111, 341, 1130, 3969, 15002, 58429, 239045, 1012241

(list; graph; refs; listen; history; text; internal format)

OFFSET

3,5

LINKS

Table of n, a(n) for n=3..18.

Hugo Pfoertner, Illustration of terms a(3)-a(7), 2023.

CROSSREFS

Cf. A010355, A339070, A342558, A360030.

Sequence in context: A299164 A131408 A137917 * A244099 A201371 A244061

Adjacent sequences: A360028 A360029 A360030 * A360032 A360033 A360034

KEYWORD

nonn,more

AUTHOR

Hugo Pfoertner, Mar 11 2023

STATUS

approved