T(n,k)=Number of nXk 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.
A233026
T(n,k)=Number of nXk 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) =1a(1) =3a(2) =3a(3) =9a(4) =15a(5) =9a(6) =27a(7) =81a(8) =81a(9) =27a(10) =81a(11) =435a(12) =849a(13) =435a(14) =81a(15) =243a(16) =2337a(17) =8835a(18) =8835a(19) =2337a(20) =243a(21) =729a(22) =12555a(23) =92067a(24) =179999a(25) =92067a(26) =12555a(27) =729a(28) =2187a(29) =67449
External references
- oeis: A233026