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%I #4 Oct 15 2024 15:47:07
%S 1,1,2,6,117,9691,5328136,18490880339,437425741017623,
%T 72201603445260460729,85704032961379965273243136,
%U 746789021667791689307771100458717,48671404211097237572497575028382156068182,24090982261278741928086824237920135192809826750606,91765357087196227652413496510903409610512369965590600589002
%N Number of {-1,0,1} n X n matrices with all rows and columns summing to zero up to permutations of rows.
%C Columns are not permutable.
%C Equivalently, the number of n X n 0..2 arrays with row sums n and column sums n up to permutation of rows.
%Y Main diagonal of A377063.
%Y Cf. A172645.
%K nonn
%O 0,3
%A _Andrew Howroyd_, Oct 15 2024