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

Terms

a(0) =338a(1) =2038a(2) =2038a(3) =12278a(4) =21466a(5) =12278a(6) =72802a(7) =224698a(8) =224698a(9) =72802a(10) =434174a(11) =2270854a(12) =4071834a(13) =2270854a(14) =434174a(15) =2588842a(16) =23369314a(17) =69579654a(18) =69579654a(19) =23369314a(20) =2588842a(21) =15426974a(22) =240280270a(23) =1231779874a(24) =1926378146a(25) =1231779874