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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.

A326974 Number of unlabeled set-systems covering n vertices where every vertex is the unique common element of some subset of the edges, also called unlabeled covering T_1 set-systems.

Table of values

n a(n)
0 1
1 1
2 2
3 16
4 1212

List of values

[1, 1, 2, 16, 1212]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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