A333738 - cp's OEIS frontend

A333738 Number of non-isomorphic n X n 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	2
3	5
4	33
5	556
6	31781
7	5882230
8	3589936407
9	7347418294141
10	51304793433150418
11	1240428029662246026001
12	105148289475978338858008298
13	31582581551955332317665959184087

[1, 1, 2, 5, 33, 556, 31781, 5882230, 3589936407, 7347418294141, 51304793433150418, 1240428029662246026001, 105148289475978338858008298, 31582581551955332317665959184087]

cp's OEIS Frontend

A333738 Number of non-isomorphic n X n 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