A333737 - cp's OEIS frontend

A333737 Array read by antidiagonals: T(n,k) is the number of non-isomorphic n X n nonnegative integer symmetric matrices with all row and column sums equal to k up to permutations of rows and columns.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	2
13	1
14	1
15	1
16	1
17	2
18	3
19	1
20	1
21	1
22	1
23	3
24	5
25	5
26	1
27	1
28	1
29	1
30	3
31	9
32	12
33	7
34	1
35	1
36	1
37	1
38	4
39	13
40	33
41	29
42	11
43	1
44	1
45	1
46	1
47	4
48	20
49	74
50	142
51	79
52	15
53	1
54	1
55	1
56	1
57	5
58	28
59	163
60	556
61	742
62	225
63	22
64	1
65	1
66	1
67	1
68	5
69	39
70	319
71	1919
72	5369
73	4454
74	677
75	30
76	1
77	1

[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 3, 1, 1, 1, 1, 3, 5, 5, 1, 1, 1, 1, 3, 9, 12, 7, 1, 1, 1, 1, 4, 13, 33, 29, 11, 1, 1, 1, 1, 4, 20, 74, 142, 79, 15, 1, 1, 1, 1, 5, 28, 163, 556, 742, 225, 22, 1, 1, 1, 1, 5, 39, 319, 1919, 5369, 4454, 677, 30, 1, 1]

cp's OEIS Frontend

A333737 Array read by antidiagonals: T(n,k) is the number of non-isomorphic n X n nonnegative integer symmetric matrices with all row and column sums equal to k up to permutations of rows and columns.

Table of values

List of values