Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.
A207422
Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.
Terms
- a(0) =9a(1) =81a(2) =361a(3) =1521a(4) =6889a(5) =29929a(6) =127449a(7) =546121a(8) =2337841a(9) =9979281a(10) =42601729a(11) =181899169a(12) =776458225a(13) =3314189761a(14) =14146485721a(15) =60382741441a(16) =257733905625
External references
- oeis: A207422