T(n,k)=Number of nXk 0..3 arrays with values 0..3 introduced in row major order and no element equal to any horizontal or vertical neighbor.

A198715

T(n,k)=Number of nXk 0..3 arrays with values 0..3 introduced in row major order and no element equal to any horizontal or vertical neighbor.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =2a(6) =5a(7) =25a(8) =25a(9) =5a(10) =14a(11) =172a(12) =401a(13) =172a(14) =14a(15) =41a(16) =1201a(17) =6548a(18) =6548a(19) =1201a(20) =41a(21) =122a(22) =8404a(23) =107042a(24) =250031a(25) =107042a(26) =8404a(27) =122a(28) =365a(29) =58825

External references