Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,1,2,0,4 for x=0,1,2,3,4.
A196906
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,1,2,0,4 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =6a(2) =13a(3) =34a(4) =81a(5) =199a(6) =487a(7) =1190a(8) =2910a(9) =7115a(10) =17398a(11) =42539a(12) =104013a(13) =254325a(14) =621854a(15) =1520506a(16) =3717817a(17) =9090502a(18) =22227349a(19) =54348491a(20) =132888475a(21) =324928002a(22) =794487306a(23) =1942615215a(24) =4749923434a(25) =11614123295a(26) =28397901945a(27) =69436221265a(28) =169779754602
External references
- oeis: A196906