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.

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

Offset

0,3

Links

Table of n, a(n) for n=0..30.

Crossrefs

Row n=5 of A333737.

Sequence in context: A252832 A074468 A303091 * A179599 A266473 A297677

Adjacent sequences: A333884 A333885 A333886 * A333888 A333889 A333890

Keyword

nonn

Author

Andrew Howroyd, Apr 08 2020

Status

approved