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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.

A245567 Number of antichain covers of a labeled n-set such that for every two distinct elements in the n-set, there is a set in the antichain cover containing one of the elements but not the other.

Table of values

n a(n)
0 2
1 1
2 1
3 5
4 76
5 5993
6 7689745
7 2414465044600
8 56130437141763247212112
9 286386577668298408602599478477358234902247

List of values

[2, 1, 1, 5, 76, 5993, 7689745, 2414465044600, 56130437141763247212112, 286386577668298408602599478477358234902247]

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

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