Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.
A207854
Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically.
Terms
- a(0) =9a(1) =81a(2) =289a(3) =1369a(4) =5929a(5) =26569a(6) =117649a(7) =522729a(8) =2319529a(9) =10297681a(10) =45711121a(11) =202920025a(12) =900780169a(13) =3998665225a(14) =17750499361a(15) =78796419849a(16) =349785896329
External references
- oeis: A207854