Number of n X 2 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically, diagonally or antidiagonally, and top left element zero.
A233020
Number of n X 2 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically, diagonally or antidiagonally, and top left element zero.
Terms
- a(0) =3a(1) =15a(2) =81a(3) =435a(4) =2337a(5) =12555a(6) =67449a(7) =362355a(8) =1946673a(9) =10458075a(10) =56183721a(11) =301834755a(12) =1621541217a(13) =8711375595a(14) =46799960409a(15) =251422553235
External references
- oeis: A233020