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 4,0,1,0,1 for x=0,1,2,3,4.
A197672
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 4,0,1,0,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =3a(2) =3a(3) =4a(4) =9a(5) =4a(6) =5a(7) =22a(8) =22a(9) =5a(10) =9a(11) =71a(12) =95a(13) =71a(14) =9a(15) =16a(16) =217a(17) =546a(18) =546a(19) =217a(20) =16a(21) =25a(22) =642a(23) =2765a(24) =5005a(25) =2765a(26) =642a(27) =25a(28) =39a(29) =1963
External references
- oeis: A197672