Number of (n+1) X 4 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.

A186456

Number of (n+1) X 4 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.

Terms

    a(0) =42a(1) =51a(2) =111a(3) =162a(4) =270a(5) =362a(6) =590a(7) =846a(8) =1362a(9) =1998a(10) =3122a(11) =4622a(12) =7126a(13) =10642a(14) =16286a(15) =24442a(16) =37230a(17) =56046a(18) =85138a(19) =128414a(20) =194754a(21) =294094a(22) =445590a(23) =673362a(24) =1019630a(25) =1541514a(26) =2333390a(27) =3528654a(28) =5340178a(29) =8076974

External references