A345246 Number of 2-connected unlabeled simple graphs with no triangles.
1, 2, 6, 16, 78, 415, 3374, 35860, 524386, 10193061, 263036202, 8948113645, 400280198048
Offset: 4
Examples
For n=4 the only example is a 4-cycle.
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
For n=4 the only example is a 4-cycle.