T(n,k)=Number of nXk 0..n+k-2 arrays with upper left zero and lower right n+k-2 and each element differing from its horizontal and vertical neighbors by one or two.
A265447
T(n,k)=Number of nXk 0..n+k-2 arrays with upper left zero and lower right n+k-2 and each element differing from its horizontal and vertical neighbors by one or two.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =2a(8) =2a(9) =2a(10) =9a(11) =53a(12) =145a(13) =53a(14) =9a(15) =29a(16) =455a(17) =2825a(18) =2825a(19) =455a(20) =29a(21) =79a(22) =2218a(23) =25069a(24) =57721a(25) =25069a(26) =2218a(27) =79a(28) =220a(29) =9702
External references
- oeis: A265447