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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, 1, 2, 6, 117, 9691, 5328136, 18490880339, 437425741017623, 72201603445260460729, 85704032961379965273243136, 746789021667791689307771100458717, 48671404211097237572497575028382156068182, 24090982261278741928086824237920135192809826750606, 91765357087196227652413496510903409610512369965590600589002
OFFSET
0,3
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.
Sequence in context: A374816 A231537 A303441 * A075391 A376378 A212158
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Oct 15 2024
STATUS
approved