A058123 - cp's OEIS frontend

A058123 Triangle read by rows: semigroups of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

n	a(n)
1	1
2	2
3	2
4	5
5	7
6	6
7	19
8	37
9	44
10	26
11	132
12	216
13	351
14	326
15	135
16	3107
17	1780
18	3093
19	4157
20	2961
21	875
22	623615
23	32652
24	33445
25	53145
26	56020
27	30395
28	6749
29	1834861133
30	4665709
31	600027
32	754315
33	1007475
34	822176
35	348692
36	60601
37	52976551026562
38	12710266442
39	68769167
40	14050493
41	18660074
42	20044250
43	12889961
44	4389418
45	618111

[1, 2, 2, 5, 7, 6, 19, 37, 44, 26, 132, 216, 351, 326, 135, 3107, 1780, 3093, 4157, 2961, 875, 623615, 32652, 33445, 53145, 56020, 30395, 6749, 1834861133, 4665709, 600027, 754315, 1007475, 822176, 348692, 60601, 52976551026562, 12710266442, 68769167, 14050493, 18660074, 20044250, 12889961, 4389418, 618111]

cp's OEIS Frontend

A058123 Triangle read by rows: semigroups 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

List of values