Number of n X 3 binary arrays with all 1s connected, a path of 1s from top row to bottom row, and no 1 having more than two 1s adjacent.
A163715
Number of n X 3 binary arrays with all 1s connected, a path of 1s from top row to bottom row, and no 1 having more than two 1s adjacent.
Terms
- a(0) =6a(1) =21a(2) =48a(3) =108a(4) =236a(5) =506a(6) =1080a(7) =2294a(8) =4854a(9) =10248a(10) =21614a(11) =45564a(12) =96028a(13) =202354a(14) =426376a(15) =898374a(16) =1892838a(17) =3988096a(18) =8402638a(19) =17703724a(20) =37300364a(21) =78588906a(22) =165580536a(23) =348864886a(24) =735030230a(25) =1548649464a(26) =3262879566a(27) =6874624124a(28) =14484278588a(29) =30517206754
External references
- oeis: A163715