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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.

A006905 Number of transitive relations on n labeled nodes.

Table of values

n a(n)
0 1
1 2
2 13
3 171
4 3994
5 154303
6 9415189
7 878222530
8 122207703623
9 24890747921947
10 7307450299510288
11 3053521546333103057
12 1797003559223770324237
13 1476062693867019126073312
14 1679239558149570229156802997
15 2628225174143857306623695576671
16 5626175867513779058707006016592954
17 16388270713364863943791979866838296851
18 64662720846908542794678859718227127212465

List of values

[1, 2, 13, 171, 3994, 154303, 9415189, 878222530, 122207703623, 24890747921947, 7307450299510288, 3053521546333103057, 1797003559223770324237, 1476062693867019126073312, 1679239558149570229156802997, 2628225174143857306623695576671, 5626175867513779058707006016592954, 16388270713364863943791979866838296851, 64662720846908542794678859718227127212465]

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

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