T(n,k)=Number of nXk 0..3 arrays with adjacent row and column sums unequal.

Terms

a(0) =4a(1) =12a(2) =12a(3) =36a(4) =184a(5) =36a(6) =108a(7) =2428a(8) =2428a(9) =108a(10) =324a(11) =32676a(12) =143028a(13) =32676a(14) =324a(15) =972a(16) =443100a(17) =8196796a(18) =8196796a(19) =443100a(20) =972a(21) =2916a(22) =5967248a(23) =464590190a(24) =1960824272a(25) =464590190a(26) =5967248a(27) =2916a(28) =8748a(29) =80018540