Number of n X 1 0..n+1-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
A265451
Number of n X 1 0..n+1-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =12a(4) =66a(5) =360a(6) =1864a(7) =9358a(8) =45642a(9) =217590a(10) =1017626a(11) =4684896a(12) =21284488a(13) =95624666a(14) =425523864a(15) =1878025074a(16) =8229470812a(17) =35836393568a(18) =155196577484a(19) =668832795812
External references
- oeis: A265451