Number of nX7 zero-sum -1..1 arrays with rows and columns lexicographically nondecreasing.

A202032

Number of nX7 zero-sum -1..1 arrays with rows and columns lexicographically nondecreasing.

Terms

    a(0) =4a(1) =555a(2) =207562a(3) =108479344a(4) =54711391946

External references