Number of nX3 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 3 neighboring 1s.
A296400
Number of nX3 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 3 neighboring 1s.
Terms
- a(0) =1a(1) =8a(2) =24a(3) =82a(4) =316a(5) =1182a(6) =4560a(7) =17508a(8) =67310a(9) =259398a(10) =999368a(11) =3851828a(12) =14846772a(13) =57226834a(14) =220589358a(15) =850295818a(16) =3277615080a(17) =12634174925a(18) =48700783032a(19) =187726368115a(20) =723626846696
External references
- oeis: A296400