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.

A058118 Triangle: self-converse semigroups of order n with k idempotents.

Table of values

n a(n)
1 1
2 2
3 1
4 5
5 5
6 2
7 18
8 24
9 16
10 6
11 93
12 123
13 112
14 58
15 19
16 930
17 754
18 764
19 542
20 254
21 68
22 22899
23 6721
24 5567
25 4751
26 2933
27 1214
28 285
29 1937266
30 123988
31 49969
32 41939
33 31392
34 17396
35 6513
36 1376
37 613365656
38 8265721
39 739317
40 410158
41 328937
42 223226
43 113160
44 38979
45 7510

List of values

[1, 2, 1, 5, 5, 2, 18, 24, 16, 6, 93, 123, 112, 58, 19, 930, 754, 764, 542, 254, 68, 22899, 6721, 5567, 4751, 2933, 1214, 285, 1937266, 123988, 49969, 41939, 31392, 17396, 6513, 1376, 613365656, 8265721, 739317, 410158, 328937, 223226, 113160, 38979, 7510]

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

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