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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.

A242432 Length of longest chain of nonempty proper subsemigroups of the monoid of partial injective orientation-preserving functions of a chain with n elements.

Table of values

n a(n)
1 1
2 6
3 24
4 92
5 363
6 1483
7 6191
8 26077
9 109987
10 462900
11 1941613
12 8115138
13 33805905
14 140413073
15 581694265
16 2404314784
17 9917782935
18 40837958578
19 167889571658
20 689231516287
21 2825851058202
22 11572537702747
23 47342211484912
24 193485587828057
25 790066214186999
26 3223470297388819
27 13141840760544209
28 53540833421980514

List of values

[1, 6, 24, 92, 363, 1483, 6191, 26077, 109987, 462900, 1941613, 8115138, 33805905, 140413073, 581694265, 2404314784, 9917782935, 40837958578, 167889571658, 689231516287, 2825851058202, 11572537702747, 47342211484912, 193485587828057, 790066214186999, 3223470297388819, 13141840760544209, 53540833421980514]

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

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