T(n,k)=Number of zero-sum nXk -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.

A201958

T(n,k)=Number of zero-sum nXk -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors.

Terms

    a(0) =1a(1) =7a(2) =7a(3) =37a(4) =231a(5) =37a(6) =231a(7) =1587a(8) =1587a(9) =231a(10) =1451a(11) =17903a(12) =17091a(13) =17903a(14) =1451a(15) =9331a(16) =194633a(17) =303955a(18) =303955a(19) =194633a(20) =9331a(21) =60691a(22) =2232183a(23) =4735345a(24) =9654533a(25) =4735345a(26) =2232183a(27) =60691a(28) =398567a(29) =25952953

External references