T(n,k)=Number of (n+4)X(k+4) binary arrays with every 1 having exactly three king-move neighbors equal to 1 but with no 2X2 blocks of 1s.

A183465

T(n,k)=Number of (n+4)X(k+4) binary arrays with every 1 having exactly three king-move neighbors equal to 1 but with no 2X2 blocks of 1s.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =2a(6) =3a(7) =11a(8) =11a(9) =3a(10) =4a(11) =19a(12) =32a(13) =19a(14) =4a(15) =21a(16) =59a(17) =69a(18) =69a(19) =59a(20) =21a(21) =40a(22) =309a(23) =498a(24) =199a(25) =498a(26) =309a(27) =40a(28) =60a(29) =685

External references