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

Terms

a(0) =4a(1) =4a(2) =4a(3) =4a(4) =16a(5) =4a(6) =4a(7) =16a(8) =16a(9) =4a(10) =4a(11) =96a(12) =340a(13) =96a(14) =4a(15) =4a(16) =104a(17) =832a(18) =832a(19) =104a(20) =4a(21) =4a(22) =904a(23) =6784a(24) =89520a(25) =6784a(26) =904a(27) =4a(28) =4a(29) =788