cp's OEIS Frontend

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.

A210913 Number of transitive reflexive early confluent binary relations R on n labeled elements where |{y : xRy}| <= 5 for all x.

Table of values

n a(n)
0 1
1 1
2 4
3 26
4 243
5 2992
6 41223
7 660220
8 11979669
9 243048992
10 5448497434
11 133595966164
12 3555887814602
13 102064563003898
14 3141580135645330
15 103198691666336823
16 3602725068242695657
17 133174089439019869924
18 5195463138498447345478
19 213295995976349091757666

List of values

[1, 1, 4, 26, 243, 2992, 41223, 660220, 11979669, 243048992, 5448497434, 133595966164, 3555887814602, 102064563003898, 3141580135645330, 103198691666336823, 3602725068242695657, 133174089439019869924, 5195463138498447345478, 213295995976349091757666]

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

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