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

0,3

Links

Table of n, a(n) for n=0..16.

Crossrefs

Column k=5 of A333733.

Sequence in context: A073587 A366698 A337869 * A220704 A061377 A183604

Adjacent sequences: A333733 A333734 A333735 * A333737 A333738 A333739

Keyword

nonn

Author

Andrew Howroyd, Apr 04 2020

Status

approved