T(n,k) is the number of n X k zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing.

A201989

T(n,k) is the number of n X k zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing.

Terms

    a(0) =1a(1) =4a(2) =4a(3) =8a(4) =77a(5) =8a(6) =18a(7) =1170a(8) =1170a(9) =18a(10) =32a(11) =14107a(12) =134217a(13) =14107a(14) =32a(15) =58a(16) =139471a(17) =11648559a(18) =11648559a(19) =139471a(20) =58a(21) =94a(22) =1177568a(23) =803133854a(24) =7375608084a(25) =803133854a(26) =1177568a(27) =94a(28) =151a(29) =8721417

External references