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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.

A210917 Number of transitive reflexive early confluent binary relations R on n labeled elements where |{y : xRy}| <= 9 for all x.

Table of values

n a(n)
0 1
1 1
2 4
3 26
4 243
5 2992
6 45906
7 845287
8 18182926
9 447797646
10 12327513326
11 374460094229
12 12417692352452
13 445937963850159
14 17230880407496706
15 712587605616915013
16 31399448829720502520
17 1468521294946336416768
18 72650756455913144620677
19 3790469182850937732166657

List of values

[1, 1, 4, 26, 243, 2992, 45906, 845287, 18182926, 447797646, 12327513326, 374460094229, 12417692352452, 445937963850159, 17230880407496706, 712587605616915013, 31399448829720502520, 1468521294946336416768, 72650756455913144620677, 3790469182850937732166657]

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

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