Number of (n+1) X 2 binary arrays with no 2 X 2 subblock commuting with any of its horizontal and vertical 2 X 2 subblock neighbors.

A187721

Number of (n+1) X 2 binary arrays with no 2 X 2 subblock commuting with any of its horizontal and vertical 2 X 2 subblock neighbors.

Terms

    a(0) =16a(1) =43a(2) =130a(3) =391a(4) =1173a(5) =3520a(6) =10558a(7) =31672a(8) =95004a(9) =284980a(10) =854840a(11) =2564222a(12) =7691771a(13) =23072626a(14) =69209824a(15) =207605302a(16) =622743418a(17) =1868012800a(18) =5603386130a(19) =16808201791a(20) =50418736274a(21) =151238603566a(22) =453663001075

External references