Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A302524
Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =10a(2) =42a(3) =168a(4) =902a(5) =3256a(6) =15852a(7) =77904a(8) =314276a(9) =1506894a(10) =7035934a(11) =30537794a(12) =143024948a(13) =655833426a(14) =2937151450a(15) =13568476862a(16) =61920768478a(17) =280707441628
External references
- oeis: A302524