A352472 - cp's OEIS frontend

A352472 Triangle T(n,k) read by rows: the number of traceless symmetric binary n X n matrices with 2k one's and no all-1 2 X 2 submatrix.

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	3
7	1
8	1
9	6
10	15
11	20
12	12
13	1
14	10
15	45
16	120
17	195
18	162
19	15
20	1
21	15
22	105
23	455
24	1320
25	2508
26	2680
27	900
28	1
29	21
30	210
31	1330
32	5880
33	18564
34	40474
35	54750
36	35595
37	6615
38	1
39	28
40	378
41	3276
42	20265
43	93240
44	320040
45	795120
46	1333080
47	1323840
48	619920
49	90720
50	1
51	36
52	630
53	7140
54	58527
55	364896

[1, 1, 1, 1, 3, 3, 1, 1, 6, 15, 20, 12, 1, 10, 45, 120, 195, 162, 15, 1, 15, 105, 455, 1320, 2508, 2680, 900, 1, 21, 210, 1330, 5880, 18564, 40474, 54750, 35595, 6615, 1, 28, 378, 3276, 20265, 93240, 320040, 795120, 1333080, 1323840, 619920, 90720, 1, 36, 630, 7140, 58527, 364896]

cp's OEIS Frontend

A352472 Triangle T(n,k) read by rows: the number of traceless symmetric binary n X n matrices with 2k one's and no all-1 2 X 2 submatrix.

Table of values

List of values