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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.

A242429 Length of longest chain of nonempty proper subsemigroups of the monoid of partial injective order-preserving functions of a chain with n elements.

Table of values

n a(n)
1 1
2 5
3 17
4 53
5 167
6 550
7 1899
8 6809
9 25067
10 93902
11 355775
12 1358208
13 5212573
14 20082860
15 77607895
16 300638481
17 1166999699
18 4537960846
19 17673418311
20 68924837252
21 269132082925
22 1052055773292
23 4116727946687
24 16123827007348
25 63205353550497
26 247959367137320
27 973469914150619
28 3824345703033374
29 15033634055076857

List of values

[1, 5, 17, 53, 167, 550, 1899, 6809, 25067, 93902, 355775, 1358208, 5212573, 20082860, 77607895, 300638481, 1166999699, 4537960846, 17673418311, 68924837252, 269132082925, 1052055773292, 4116727946687, 16123827007348, 63205353550497, 247959367137320, 973469914150619, 3824345703033374, 15033634055076857]

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

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