T(n,k) is the number of (n+1) X (k+1) 0..3 matrices with each 2 X 2 permanent equal.

Terms

a(0) =256a(1) =912a(2) =912a(3) =3067a(4) =11196a(5) =3067a(6) =13654a(7) =110253a(8) =110253a(9) =13654a(10) =59330a(11) =1777586a(12) =1417535a(13) =1777586a(14) =59330a(15) =294349a(16) =26732072a(17) =49673755a(18) =49673755a(19) =26732072a(20) =294349a(21) =1450678a(22) =435788333a(23) =946613919a(24) =4560581070a(25) =946613919a(26) =435788333a(27) =1450678