T(n,k)=Number of 2nX2k 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.

A198604

T(n,k)=Number of 2nX2k 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =2a(6) =5a(7) =32a(8) =32a(9) =5a(10) =14a(11) =251a(12) =674a(13) =251a(14) =14a(15) =41a(16) =1985a(17) =14396a(18) =14396a(19) =1985a(20) =41a(21) =122a(22) =15761a(23) =309770a(24) =844228a(25) =309770a(26) =15761a(27) =122a(28) =365a(29) =125168

External references