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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.

A210915 Number of transitive reflexive early confluent binary relations R on n labeled elements where |{y : xRy}| <= 7 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 17637091
9 412976516
10 10702355041
11 304058582059
12 9396887340381
13 313853270626962
14 11265355519125229
15 432420217726582213
16 17674492093095982705
17 766343475354260380416
18 35129831766609666284023
19 1697466558811335003294745

List of values

[1, 1, 4, 26, 243, 2992, 45906, 845287, 17637091, 412976516, 10702355041, 304058582059, 9396887340381, 313853270626962, 11265355519125229, 432420217726582213, 17674492093095982705, 766343475354260380416, 35129831766609666284023, 1697466558811335003294745]

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

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