Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,1,1,1 for x=0,1,2,3,4.
A197608
Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,1,1,1 for x=0,1,2,3,4.
Terms
- a(0) =2a(1) =14a(2) =67a(3) =366a(4) =1840a(5) =9361a(6) =47610a(7) =242254a(8) =1234052a(9) =6286646a(10) =32024913a(11) =163120939a(12) =830844663a(13) =4231926412a(14) =21555688607a(15) =109796116924a(16) =559256572765
External references
- oeis: A197608