This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A377064 #4 Oct 15 2024 15:47:07
%S A377064 1,1,2,6,117,9691,5328136,18490880339,437425741017623,
%T A377064 72201603445260460729,85704032961379965273243136,
%U A377064 746789021667791689307771100458717,48671404211097237572497575028382156068182,24090982261278741928086824237920135192809826750606,91765357087196227652413496510903409610512369965590600589002
%N A377064 Number of {-1,0,1} n X n matrices with all rows and columns summing to zero up to permutations of rows.
%C A377064 Columns are not permutable.
%C A377064 Equivalently, the number of n X n 0..2 arrays with row sums n and column sums n up to permutation of rows.
%Y A377064 Main diagonal of A377063.
%Y A377064 Cf. A172645.
%K A377064 nonn
%O A377064 0,3
%A A377064 _Andrew Howroyd_, Oct 15 2024