A377064 Number of {-1,0,1} n X n matrices with all rows and columns summing to zero up to permutations of rows.

1, 1, 2, 6, 117, 9691, 5328136, 18490880339, 437425741017623, 72201603445260460729, 85704032961379965273243136, 746789021667791689307771100458717, 48671404211097237572497575028382156068182, 24090982261278741928086824237920135192809826750606, 91765357087196227652413496510903409610512369965590600589002

Offset: 0

Author

Andrew Howroyd, Oct 15 2024

Keywords

• nonn

Comments

Columns are not permutable.

Equivalently, the number of n X n 0..2 arrays with row sums n and column sums n up to permutation of rows.

Crossrefs

Main diagonal of A377063.

Cf. A172645.