T(n,k) is the number of n X k 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
A200801
T(n,k) is the number of n X k 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =5a(4) =15a(5) =5a(6) =15a(7) =178a(8) =178a(9) =15a(10) =51a(11) =2614a(12) =9880a(13) =2614a(14) =51a(15) =187a(16) =40148a(17) =583813a(18) =583813a(19) =40148a(20) =187a(21) =715a(22) =622645a(23) =34679839a(24) =132636590a(25) =34679839a(26) =622645a(27) =715a(28) =2795a(29) =9676364
External references
- oeis: A200801