Number of n X 2 0..2 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..2 introduced in row major order.
A241073
Number of n X 2 0..2 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..2 introduced in row major order.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =39a(4) =131a(5) =444a(6) =1516a(7) =5195a(8) =17847a(9) =61424a(10) =211672a(11) =730119a(12) =2520091a(13) =8702628a(14) =30063396a(15) =103881123a(16) =359017439a(17) =1240945016a(18) =4289745552a(19) =14829991071a(20) =51271047939a(21) =177263517036a(22) =612883590684
External references
- oeis: A241073