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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.

A330057 Number of set-systems covering n vertices with no singletons or endpoints.

Table of values

n a(n)
0 1
1 0
2 0
3 5
4 1703
5 66954642
6 144115175199102143
7 1329227995784915808340204290157341181
8 226156424291633194186662080095093568664788471116325389572604136316742486364

List of values

[1, 0, 0, 5, 1703, 66954642, 144115175199102143, 1329227995784915808340204290157341181, 226156424291633194186662080095093568664788471116325389572604136316742486364]

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

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