Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1s.
A297546
Number of 3Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1s.
Terms
- a(0) =1a(1) =4a(2) =35a(3) =93a(4) =197a(5) =905a(6) =4617a(7) =17190a(8) =60751a(9) =249752a(10) =1059063a(11) =4222592a(12) =16594402a(13) =66999457a(14) =272610044a(15) =1096920548a(16) =4397739438a(17) =17715067000a(18) =71488573309a(19) =287925302744
External references
- oeis: A297546