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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.

A369778 Number of inequivalent (as defined below) transitive binary relations on [n].

Table of values

n a(n)
0 1
1 2
2 9
3 69
4 838
5 15673
6 446723
7 19293060
8 1251685959
9 120386313553
10 16900121126060
11 3411142115103803
12 977085613480027515
13 392874276568326733742
14 219743920204264577507581
15 169664195991510052549565897
16 179646979835553234783655867894
17 259379781267410563698300438118605
18 508142540645401577520522108019282903

List of values

[1, 2, 9, 69, 838, 15673, 446723, 19293060, 1251685959, 120386313553, 16900121126060, 3411142115103803, 977085613480027515, 392874276568326733742, 219743920204264577507581, 169664195991510052549565897, 179646979835553234783655867894, 259379781267410563698300438118605, 508142540645401577520522108019282903]

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

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