Number of n X 3 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
A230270
Number of n X 3 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
Terms
- a(0) =0a(1) =2a(2) =28a(3) =258a(4) =2318a(5) =19996a(6) =173042a(7) =1495602a(8) =12923884a(9) =111679970a(10) =965051522a(11) =8339221132a(12) =72061022634a(13) =622694890854
External references
- oeis: A230270