Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 0 and 1 0 1 vertically.
A207786
Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 0 and 1 0 1 vertically.
Terms
- a(0) =9a(1) =81a(2) =253a(3) =791a(4) =2173a(5) =5241a(6) =12567a(7) =28101a(8) =61397a(9) =131083a(10) =272789a(11) =560651a(12) =1133751a(13) =2266643a(14) =4487109a(15) =8799557a(16) =17130019a(17) =33113221a(18) =63623053a(19) =121586791a(20) =231212705a(21) =437760595a(22) =825496887a(23) =1550995293a(24) =2904417145a(25) =5422206945a(26) =10094193051
External references
- oeis: A207786