Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,4,0,0,1 for x=0,1,2,3,4.
A197092
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,4,0,0,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =7a(2) =18a(3) =55a(4) =163a(5) =484a(6) =1439a(7) =4275a(8) =12704a(9) =37749a(10) =112171a(11) =333314a(12) =990437a(13) =2943067a(14) =8745274a(15) =25986435a(16) =77218255a(17) =229452748a(18) =681814987a(19) =2026001783a(20) =6020230272a(21) =17889013145a(22) =53156902119a(23) =157954841890a(24) =469360159865
External references
- oeis: A197092