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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.

A326972 Number of unlabeled set-systems on n vertices whose dual is a (strict) antichain, also called unlabeled T_1 set-systems.

Table of values

n	a(n)
0	1
1	2
2	4
3	20
4	1232

List of values

[1, 2, 4, 20, 1232]

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

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