Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,0,0 for x=0,1,2,3,4.
A197531
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =3a(1) =9a(2) =16a(3) =33a(4) =73a(5) =160a(6) =361a(7) =835a(8) =1966a(9) =4703a(10) =11399a(11) =27914a(12) =68903a(13) =171121a(14) =426940a(15) =1068865a(16) =2682789a(17) =6746336a(18) =16988333a(19) =42822747a(20) =108024178a(21) =272648551a(22) =688426371a(23) =1738750602a(24) =4392467427a(25) =11098043841a(26) =28043540864a(27) =70868720569a(28) =179102669081
External references
- oeis: A197531