T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,1,0,1 for x=0,1,2,3,4.

A197679

T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,1,0,1 for x=0,1,2,3,4.

Terms

    a(0) =1a(1) =3a(2) =3a(3) =4a(4) =9a(5) =4a(6) =5a(7) =16a(8) =16a(9) =5a(10) =9a(11) =33a(12) =57a(13) =33a(14) =9a(15) =16a(16) =73a(17) =202a(18) =202a(19) =73a(20) =16a(21) =25a(22) =160a(23) =721a(24) =1111a(25) =721a(26) =160a(27) =25a(28) =39a(29) =361

External references