T(n,k)=Number of zero-sum nXk -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.

A202047

T(n,k)=Number of zero-sum nXk -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.

Terms

    a(0) =1a(1) =3a(2) =3a(3) =7a(4) =19a(5) =7a(6) =19a(7) =73a(8) =73a(9) =19a(10) =51a(11) =335a(12) =415a(13) =335a(14) =51a(15) =141a(16) =1593a(17) =2921a(18) =2921a(19) =1593a(20) =141a(21) =393a(22) =7669a(23) =19541a(24) =31753a(25) =19541a(26) =7669a(27) =393a(28) =1107a(29) =37311

External references