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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.

A058147 Triangle read by rows: number of monoids of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 3
6 2
7 2
8 9
9 10
10 6
11 1
12 30
13 47
14 52
15 26
16 2
17 175
18 283
19 413
20 365
21 135
22 1
23 3333
24 2139
25 3630
26 4597
27 3155
28 875
29 5

List of values

[1, 1, 1, 1, 3, 2, 2, 9, 10, 6, 1, 30, 47, 52, 26, 2, 175, 283, 413, 365, 135, 1, 3333, 2139, 3630, 4597, 3155, 875, 5]