A220886 - cp's OEIS frontend

A220886 Irregular triangular array read by rows: T(n,k) is the number of inequivalent n X n {0,1} matrices modulo permutation of the rows, containing exactly k 1's; n>=0, 0<=k<=n^2.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	4
6	2
7	1
8	1
9	3
10	9
11	20
12	27
13	27
14	20
15	9
16	3
17	1
18	1
19	4
20	16
21	48
22	133
23	272
24	468
25	636
26	720
27	636
28	468
29	272
30	133
31	48
32	16
33	4
34	1
35	1
36	5
37	25
38	95
39	330
40	1027
41	2780
42	6550
43	13375
44	23700
45	36403
46	48405
47	55800
48	55800
49	48405
50	36403
51	23700
52	13375
53	6550
54	2780
55	1027
56	330
57	95
58	25
59	5
60	1

[1, 1, 1, 1, 2, 4, 2, 1, 1, 3, 9, 20, 27, 27, 20, 9, 3, 1, 1, 4, 16, 48, 133, 272, 468, 636, 720, 636, 468, 272, 133, 48, 16, 4, 1, 1, 5, 25, 95, 330, 1027, 2780, 6550, 13375, 23700, 36403, 48405, 55800, 55800, 48405, 36403, 23700, 13375, 6550, 2780, 1027, 330, 95, 25, 5, 1]

cp's OEIS Frontend

A220886 Irregular triangular array read by rows: T(n,k) is the number of inequivalent n X n {0,1} matrices modulo permutation of the rows, containing exactly k 1's; n>=0, 0<=k<=n^2.

Table of values

List of values