A333736 Number of non-isomorphic n X n nonnegative integer matrices with all row and column sums equal to 5 up to permutations of rows and columns.

1, 1, 3, 13, 106, 1856, 65481, 3925518, 363749095, 48962187281, 9168714763163, 2310658842185472, 762989388539984938, 322853634364149927118, 171803197981333555941746, 113132136587981136905043170, 90904234140548490596254230897

Offset: 0

Author

Andrew Howroyd, Apr 04 2020

Keywords

• nonn

Crossrefs

Column k=5 of A333733.