T(n,m)=Number of (n+1)X4 0..m arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

A188058

T(n,m)=Number of (n+1)X4 0..m arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

Terms

    a(0) =42a(1) =277a(2) =51a(3) =1098a(4) =243a(5) =111a(6) =3265a(7) =701a(8) =942a(9) =162a(10) =7988a(11) =1715a(12) =4686a(13) =1203a(14) =270a(15) =17119a(16) =3343a(17) =17015a(18) =4810a(19) =3190a(20) =362a(21) =33182a(22) =5947a(23) =49225a(24) =15061a(25) =20224a(26) =4023a(27) =590a(28) =59629a(29) =9789

External references