Number of n X 2 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.
A231025
Number of n X 2 0..2 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =12a(3) =62a(4) =344a(5) =1864a(6) =10162a(7) =55324a(8) =301278a(9) =1640592a(10) =8933808a(11) =48648834a(12) =264916012a(13) =1442593630a(14) =7855607976a(15) =42777519416a(16) =232943926258
External references
- oeis: A231025