Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,0,0 for x=0,1,2,3,4.
A197174
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,2,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =5a(2) =10a(3) =23a(4) =58a(5) =144a(6) =363a(7) =917a(8) =2321a(9) =5878a(10) =14889a(11) =37722a(12) =95576a(13) =242163a(14) =613583a(15) =1554685a(16) =3939236a(17) =9981179a(18) =25290188a(19) =64079982a(20) =162365107a(21) =411398825a(22) =1042397613a(23) =2641215094a(24) =6692280455a(25) =16956823380a(26) =42965004446a(27) =108864235075
External references
- oeis: A197174