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

Terms

a(0) =4a(1) =12a(2) =4a(3) =36a(4) =28a(5) =4a(6) =108a(7) =396a(8) =120a(9) =4a(10) =324a(11) =4904a(12) =4740a(13) =356a(14) =4a(15) =972a(16) =57100a(17) =191208a(18) =50716a(19) =1472a(20) =4a(21) =2916a(22) =690204a(23) =8536230a(24) =7788648a(25) =578696a(26) =4780a(27) =4a(28) =8748a(29) =8590508