A333886 - cp's OEIS frontend

A333886 Number of non-isomorphic 4 X 4 nonnegative integer symmetric matrices with all row and column sums equal to n up to permutations of rows and columns.

n	a(n)
0	1
1	1
2	5
3	12
4	33
5	74
6	163
7	319
8	596
9	1044
10	1754
11	2820
12	4394
13	6629
14	9756
15	14018
16	19743
17	27286
18	37111
19	49707
20	65699
21	85756
22	110691
23	141382
24	178882
25	224309
26	278990
27	344342
28	422000
29	513718
30	621506
31	747493
32	894105
33	1063920
34	1259823
35	1484886
36	1742533
37	2036377
38	2370431
39	2748936
40	3176544

[1, 1, 5, 12, 33, 74, 163, 319, 596, 1044, 1754, 2820, 4394, 6629, 9756, 14018, 19743, 27286, 37111, 49707, 65699, 85756, 110691, 141382, 178882, 224309, 278990, 344342, 422000, 513718, 621506, 747493, 894105, 1063920, 1259823, 1484886, 1742533, 2036377, 2370431, 2748936, 3176544]

cp's OEIS Frontend

A333886 Number of non-isomorphic 4 X 4 nonnegative integer symmetric matrices with all row and column sums equal to n up to permutations of rows and columns.

Table of values

List of values