T(n,k) = Number of n X k 0..3 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, and upper left element zero.
A230968
T(n,k) = Number of n X k 0..3 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, and upper left element zero.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =6a(5) =0a(6) =0a(7) =22a(8) =22a(9) =0a(10) =0a(11) =200a(12) =328a(13) =200a(14) =0a(15) =0a(16) =1732a(17) =8696a(18) =8696a(19) =1732a(20) =0a(21) =0a(22) =14384a(23) =220970a(24) =741638a(25) =220970a(26) =14384a(27) =0a(28) =0a(29) =121696
External references
- oeis: A230968