T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

A186484

T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

Terms

    a(0) =625a(1) =419a(2) =419a(3) =3265a(4) =839a(5) =3265a(6) =3335a(7) =1715a(8) =1715a(9) =3335a(10) =17608a(11) =5879a(12) =17015a(13) =5879a(14) =17608a(15) =19617a(16) =10259a(17) =15061a(18) =15061a(19) =10259a(20) =19617a(21) =89163a(22) =28628a(23) =89650a(24) =64680a(25) =89650a(26) =28628a(27) =89163a(28) =110707a(29) =53045

External references