T(n,k)=1/36 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last.

A184457

T(n,k)=1/36 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock containing two of one value, two of another, and five of the last.

Terms

    a(0) =63a(1) =234a(2) =234a(3) =864a(4) =600a(5) =864a(6) =3159a(7) =1591a(8) =1591a(9) =3159a(10) =12879a(11) =4517a(12) =3125a(13) =4517a(14) =12879a(15) =51759a(16) =16029a(17) =6880a(18) =6880a(19) =16029a(20) =51759a(21) =203391a(22) =58413a(23) =20706a(24) =11766a(25) =20706a(26) =58413a(27) =203391a(28) =898857a(29) =216477

External references