Number of nX2 zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing.

A201984

Number of nX2 zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing.

Terms

    a(0) =4a(1) =77a(2) =1170a(3) =14107a(4) =139471a(5) =1177568a(6) =8721417a(7) =57801225a(8) =347923603a(9) =1924356711a(10) =9871703167a(11) =47329086175a(12) =213435856527a(13) =910247506472

External references