T(n,k)=Number of (n+2)X(k+2) binary arrays with each 3X3 subblock nonsingular.

Terms

a(0) =174a(1) =726a(2) =726a(3) =3030a(4) =4362a(5) =3030a(6) =12630a(7) =25854a(8) =25854a(9) =12630a(10) =52662a(11) =150234a(12) =215644a(13) =150234a(14) =52662a(15) =219606a(16) =886926a(17) =1752120a(18) =1752120a(19) =886926a(20) =219606a(21) =915702a(22) =5221098a(23) =14532816a(24) =19941490a(25) =14532816a(26) =5221098a(27) =915702a(28) =3818262a(29) =30631134