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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.

A326900 Number of set-systems on n vertices that are closed under union and intersection.

Table of values

n a(n)
0 1
1 2
2 6
3 29
4 232
5 3032
6 62837
7 2009408
8 97034882
9 6952703663
10 728107141058
11 109978369078580
12 23682049666957359
13 7195441649260733390
14 3056891748255795885338
15 1801430622263459795017565
16 1462231768717868324127642932
17 1624751185398704445629757084188
18 2457871026957756859612862822442301

List of values

[1, 2, 6, 29, 232, 3032, 62837, 2009408, 97034882, 6952703663, 728107141058, 109978369078580, 23682049666957359, 7195441649260733390, 3056891748255795885338, 1801430622263459795017565, 1462231768717868324127642932, 1624751185398704445629757084188, 2457871026957756859612862822442301]

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

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