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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.

A323817 Number of connected set-systems covering n vertices with no singletons.

Table of values

n a(n)
0 1
1 0
2 1
3 12
4 1990
5 67098648
6 144115187673201808
7 1329227995784915871895000743748659792
8 226156424291633194186662080095093570015284114833799899656335137245499581360

List of values

[1, 0, 1, 12, 1990, 67098648, 144115187673201808, 1329227995784915871895000743748659792, 226156424291633194186662080095093570015284114833799899656335137245499581360]

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

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