T(n,k) = Number of n X k 0..2 arrays with row sums equal and column sums equal.

Terms

a(0) =3a(1) =3a(2) =3a(3) =3a(4) =9a(5) =3a(6) =3a(7) =9a(8) =9a(9) =3a(10) =3a(11) =33a(12) =87a(13) =33a(14) =3a(15) =3a(16) =53a(17) =177a(18) =177a(19) =53a(20) =3a(21) =3a(22) =183a(23) =993a(24) =5673a(25) =993a(26) =183a(27) =3a(28) =3a(29) =395