A286892 - cp's OEIS frontend

A286892 Triangle read by rows: T(n,m) is the number of inequivalent n X m matrices under action of the Klein group, with one-third each of 1s, 2s and 3s (ordered occurrences rounded up/down if m*n != 0 mod 3).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	3
6	1
7	3
8	27
9	438
10	1
11	6
12	140
13	8766
14	504504
15	1
16	16
17	1056
18	189774
19	33258880
20	6573403050
21	1
22	48
23	8730
24	4292514
25	2366403930
26	1387750992012
27	846182953495152
28	1
29	108
30	63108
31	99797220
32	159511561440
33	282061024690536
34	530143167401850960
35	976645996512669379710

[1, 1, 1, 1, 1, 3, 1, 3, 27, 438, 1, 6, 140, 8766, 504504, 1, 16, 1056, 189774, 33258880, 6573403050, 1, 48, 8730, 4292514, 2366403930, 1387750992012, 846182953495152, 1, 108, 63108, 99797220, 159511561440, 282061024690536, 530143167401850960, 976645996512669379710]

cp's OEIS Frontend

A286892 Triangle read by rows: T(n,m) is the number of inequivalent n X m matrices under action of the Klein group, with one-third each of 1s, 2s and 3s (ordered occurrences rounded up/down if m*n != 0 mod 3).

Table of values

List of values