T(n,k) is the number of n X k 0..3 arrays with no more than floor(n*k/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
A222842
T(n,k) is the number of n X k 0..3 arrays with no more than floor(n*k/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =8a(5) =2a(6) =11a(7) =105a(8) =105a(9) =11a(10) =34a(11) =1585a(12) =4797a(13) =1585a(14) =34a(15) =131a(16) =23107a(17) =326408a(18) =326408a(19) =23107a(20) =131a(21) =438a(22) =353631a(23) =15364848a(24) =70144361a(25) =15364848a(26) =353631a(27) =438a(28) =2150a(29) =5338646
External references
- oeis: A222842