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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.

A381089 Number of binary relations on n unlabeled points without isolated points.

Table of values

n a(n)
0 1
1 0
2 7
3 86
4 2846
5 285984
6 96348100
7 112089342912
8 458072631172864
9 6665705090236713408
10 349377212708652631367712
11 66602723210653815331014240512
12 46557323276092409455163109412993536
13 120168498152266645852126063743794842575872

List of values

[1, 0, 7, 86, 2846, 285984, 96348100, 112089342912, 458072631172864, 6665705090236713408, 349377212708652631367712, 66602723210653815331014240512, 46557323276092409455163109412993536, 120168498152266645852126063743794842575872]

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

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