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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

%I #4 Apr 04 2020 19:19:47

%S 1,1,3,13,106,1856,65481,3925518,363749095,48962187281,9168714763163,

%T 2310658842185472,762989388539984938,322853634364149927118,

%U 171803197981333555941746,113132136587981136905043170,90904234140548490596254230897

%N 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.

%Y Column k=5 of A333733.

%K nonn

%O 0,3

%A _Andrew Howroyd_, Apr 04 2020