Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 4 neighboring 1s.
A297578
Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 4 neighboring 1s.
Terms
- a(0) =4a(1) =17a(2) =72a(3) =254a(4) =1104a(5) =4428a(6) =17549a(7) =71541a(8) =288624a(9) =1160216a(10) =4688893a(11) =18915890a(12) =76255262a(13) =307700021a(14) =1241251737a(15) =5006436549a(16) =20196297041a(17) =81469428031a(18) =328628315656
External references
- oeis: A297578