A287022 - cp's OEIS frontend

A287022 Triangle read by rows: T(n,m) is the number of inequivalent n X m matrices under action of the Klein group, with a sixth of 1s, 2s, 3s, 4s, 5s and 6s (ordered occurrences rounded up/down if n*m != 0 mod 6).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	180
9	11358
10	1
11	1
12	2520
13	1872000
14	1009008000
15	1
16	1
17	56712
18	189197280
19	814774020480
20	4058338214422800
21	1
22	360
23	1871640
24	34306401600
25	811667639890800
26	22208161516294279680
27	667544434159390230643200

[1, 1, 1, 1, 1, 1, 1, 1, 180, 11358, 1, 1, 2520, 1872000, 1009008000, 1, 1, 56712, 189197280, 814774020480, 4058338214422800, 1, 360, 1871640, 34306401600, 811667639890800, 22208161516294279680, 667544434159390230643200]

cp's OEIS Frontend

A287022 Triangle read by rows: T(n,m) is the number of inequivalent n X m matrices under action of the Klein group, with a sixth of 1s, 2s, 3s, 4s, 5s and 6s (ordered occurrences rounded up/down if n*m != 0 mod 6).

Table of values

List of values