A135589 - cp's OEIS frontend

A135589 Triangle T(n,k) read by rows: number of k X k symmetric (0,1)-matrices with exactly n entries equal to 1 and no zero rows or columns.

n	a(n)
0	1
1	0
2	1
3	0
4	0
5	2
6	0
7	0
8	2
9	4
10	0
11	0
12	1
13	9
14	10
15	0
16	0
17	0
18	12
19	36
20	26
21	0
22	0
23	0
24	10
25	76
26	140
27	76
28	0
29	0
30	0
31	6
32	116
33	420
34	540
35	232
36	0
37	0
38	0
39	3
40	138
41	915
42	2160
43	2142
44	764
45	0
46	0
47	0
48	1
49	136
50	1605
51	6230
52	10766
53	8624
54	2620
55	0
56	0
57	0
58	0
59	116
60	2372
61	14436
62	39130
63	53312
64	35856
65	9496
66	0
67	0
68	0
69	0

[1, 0, 1, 0, 0, 2, 0, 0, 2, 4, 0, 0, 1, 9, 10, 0, 0, 0, 12, 36, 26, 0, 0, 0, 10, 76, 140, 76, 0, 0, 0, 6, 116, 420, 540, 232, 0, 0, 0, 3, 138, 915, 2160, 2142, 764, 0, 0, 0, 1, 136, 1605, 6230, 10766, 8624, 2620, 0, 0, 0, 0, 116, 2372, 14436, 39130, 53312, 35856, 9496, 0, 0, 0, 0]

cp's OEIS Frontend

A135589 Triangle T(n,k) read by rows: number of k X k symmetric (0,1)-matrices with exactly n entries equal to 1 and no zero rows or columns.

Table of values

List of values