Number of n X 2 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order.
A204295
Number of n X 2 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order.
Terms
- a(0) =0a(1) =4a(2) =4a(3) =16a(4) =68a(5) =212a(6) =776a(7) =3076a(8) =11540a(9) =44944a(10) =177748a(11) =700292a(12) =2779272a(13) =11069140a(14) =44107780a(15) =176038288a(16) =703199588a(17) =2809956020a(18) =11232774920a(19) =44913243940a(20) =179603461748a(21) =718287355024
External references
- oeis: A204295