Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A302821
Number of 3Xn 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =4a(1) =25a(2) =75a(3) =220a(4) =731a(5) =2419a(6) =7900a(7) =25645a(8) =83685a(9) =273504a(10) =893195a(11) =2915411a(12) =9518108a(13) =31079021a(14) =101478805a(15) =331335348a(16) =1081839931a(17) =3532345439a(18) =11533574036a(19) =37658571753a(20) =122959986781a(21) =401480186136
External references
- oeis: A302821