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.
0, 1, 1, 1, 2, 5, 14, 35, 111, 341, 1130, 3969, 15002, 58429, 239045, 1012241
Offset: 3
Links
- Hugo Pfoertner, Illustration of terms a(3)-a(7), 2023.