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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.

A330056 Number of set-systems with n vertices and no singletons or endpoints.

Table of values

n a(n)
0 1
1 1
2 1
3 6
4 1724
5 66963208
6 144115175600855641
7 1329227995784915809349010517957163445
8 226156424291633194186662080095093568675422295082604716043360995547325655259

List of values

[1, 1, 1, 6, 1724, 66963208, 144115175600855641, 1329227995784915809349010517957163445, 226156424291633194186662080095093568675422295082604716043360995547325655259]

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

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