Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,1,1 for x=0,1,2,3,4.
A197885
Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,1,1 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =14a(2) =47a(3) =155a(4) =835a(5) =2263a(6) =10827a(7) =38938a(8) =157178a(9) =654028a(10) =2607334a(11) =10482745a(12) =41930639a(13) =169374587a(14) =686689100a(15) =2793219587a(16) =11244612740a(17) =45359859580a(18) =183328706973a(19) =742423862981
External references
- oeis: A197885