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 2,2,1,0,0 for x=0,1,2,3,4.

A197180

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 2,2,1,0,0 for x=0,1,2,3,4.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =2a(6) =3a(7) =10a(8) =10a(9) =3a(10) =4a(11) =23a(12) =41a(13) =23a(14) =4a(15) =6a(16) =58a(17) =150a(18) =150a(19) =58a(20) =6a(21) =9a(22) =144a(23) =665a(24) =969a(25) =665a(26) =144a(27) =9a(28) =13a(29) =363

External references