Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 1 0 vertically.
A207489
Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 1 1 and 1 1 0 vertically.
Terms
- a(0) =9a(1) =81a(2) =177a(3) =530a(4) =1322a(5) =2749a(6) =6217a(7) =12712a(8) =25908a(9) =52474a(10) =103704a(11) =205390a(12) =402848a(13) =787367a(14) =1536289a(15) =2987863a(16) =5806685a(17) =11270614a(18) =21859130a(19) =42378217a(20) =82121061a(21) =159101032a(22) =308184196a(23) =596883878a(24) =1155938528a(25) =2238468542a(26) =4334604962
External references
- oeis: A207489