Number of n X 2 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1, 2 or 3 neighboring 1s.
A296593
Number of n X 2 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1, 2 or 3 neighboring 1s.
Terms
- a(0) =2a(1) =11a(2) =39a(3) =136a(4) =494a(5) =1785a(6) =6432a(7) =23201a(8) =83695a(9) =301885a(10) =1088905a(11) =3927736a(12) =14167501a(13) =51102728a(14) =184329596a(15) =664884245a(16) =2398264069a(17) =8650634510a(18) =31203185035a(19) =112551137627a(20) =405976459392
External references
- oeis: A296593