A333157 - cp's OEIS frontend

A333157 Triangle read by rows: T(n,k) is the number of n X n symmetric binary matrices with k ones in every row and column.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	4
8	4
9	1
10	1
11	10
12	18
13	10
14	1
15	1
16	26
17	112
18	112
19	26
20	1
21	1
22	76
23	820
24	1760
25	820
26	76
27	1
28	1
29	232
30	6912
31	35150
32	35150
33	6912
34	232
35	1
36	1
37	764
38	66178
39	848932
40	1944530
41	848932
42	66178
43	764
44	1
45	1
46	2620
47	708256
48	24243520
49	133948836
50	133948836
51	24243520
52	708256
53	2620
54	1

[1, 1, 1, 1, 2, 1, 1, 4, 4, 1, 1, 10, 18, 10, 1, 1, 26, 112, 112, 26, 1, 1, 76, 820, 1760, 820, 76, 1, 1, 232, 6912, 35150, 35150, 6912, 232, 1, 1, 764, 66178, 848932, 1944530, 848932, 66178, 764, 1, 1, 2620, 708256, 24243520, 133948836, 133948836, 24243520, 708256, 2620, 1]

cp's OEIS Frontend

A333157 Triangle read by rows: T(n,k) is the number of n X n symmetric binary matrices with k ones in every row and column.

Table of values

List of values