Number of nX6 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing.

A201494

Number of nX6 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing.

Terms

    a(0) =18a(1) =36487a(2) =168357815a(3) =732383803600

External references