A333887 - cp's OEIS frontend

A333887 Number of non-isomorphic 5 X 5 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	7
3	29
4	142
5	556
6	1919
7	5793
8	15758
9	39131
10	90185
11	194905
12	398773
13	777708
14	1454721
15	2622421
16	4575020
17	7750397
18	12787648
19	20600441
20	32473894
21	50185556
22	76161130
23	113665307
24	167041499
25	242001146
26	345981348
27	488570133
28	682023069
29	941871068
30	1287649789

[1, 1, 7, 29, 142, 556, 1919, 5793, 15758, 39131, 90185, 194905, 398773, 777708, 1454721, 2622421, 4575020, 7750397, 12787648, 20600441, 32473894, 50185556, 76161130, 113665307, 167041499, 242001146, 345981348, 488570133, 682023069, 941871068, 1287649789]

cp's OEIS Frontend

A333887 Number of non-isomorphic 5 X 5 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