Number of (n+1)X(n+1) binary arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

A186453

Number of (n+1)X(n+1) binary arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

Terms

    a(0) =16a(1) =30a(2) =111a(3) =309a(4) =797a(5) =1693a(6) =4121a(7) =9477a(8) =22933a(9) =52197a(10) =122109a(11) =277217a(12) =642629a(13) =1463845a(14) =3375245a(15) =7698781a(16) =17693113a(17) =40404005a(18) =92697797a(19) =211861205a(20) =485587357a(21) =1110399969a(22) =2543583205a(23) =5818446165a(24) =13323806077a(25) =30484799837a(26) =69794079385

External references