cp's OEIS Frontend

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.

A242428 Length of longest chain of nonempty proper subsemigroups of the dual symmetric inverse monoid.

Table of values

n a(n)
1 0
2 2
3 17
4 180
5 3298
6 88431
7 3064050
8 130905678
9 6732227475
10 409094032964
11 28917250469178
12 2346562701385648
13 216180120430479731
14 22397392442055209003
15 2588479398843886168171
16 331352273262513644199134
17 46692196905193286953380160
18 7203294536351261350956567853
19 1210694223244114528129261255186

List of values

[0, 2, 17, 180, 3298, 88431, 3064050, 130905678, 6732227475, 409094032964, 28917250469178, 2346562701385648, 216180120430479731, 22397392442055209003, 2588479398843886168171, 331352273262513644199134, 46692196905193286953380160, 7203294536351261350956567853, 1210694223244114528129261255186]

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

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