Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,0,1 for x=0,1,2,3,4.
A197674
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,0,1 for x=0,1,2,3,4.
Terms
- a(0) =4a(1) =16a(2) =57a(3) =202a(4) =721a(5) =2557a(6) =8930a(7) =31326a(8) =110217a(9) =387627a(10) =1363559a(11) =4796483a(12) =16870356a(13) =59337438a(14) =208705786a(15) =734075168a(16) =2581952574a(17) =9081465807a(18) =31942103268a(19) =112349483389a(20) =395165129695
External references
- oeis: A197674