T(n,k)=Number of (n+1)X(k+1) 0..6 arrays with every 2X2 subblock summing to 12.

Terms

a(0) =231a(1) =1225a(2) =1225a(3) =6951a(4) =5215a(5) =6951a(6) =41209a(7) =24745a(8) =24745a(9) =41209a(10) =251991a(11) =126223a(12) =100935a(13) =126223a(14) =251991a(15) =1577065a(16) =678265a(17) =451801a(18) =451801a(19) =678265a(20) =1577065a(21) =10049991a(22) =3791935a(23) =2163831a(24) =1803007a(25) =2163831a(26) =3791935a(27) =10049991a(28) =64979929