Number of nX3 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing.

A201491

Number of nX3 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing.

Terms

    a(0) =5a(1) =226a(2) =9331a(3) =301432a(4) =7798656a(5) =168357815a(6) =3127432827a(7) =51118964623a(8) =747555368709

External references