Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001001.

A260288

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001001.

Terms

    a(0) =104a(1) =201a(2) =544a(3) =1145a(4) =1524a(5) =3591a(6) =8550a(7) =13055a(8) =24762a(9) =60761a(10) =108910a(11) =183673a(12) =423938a(13) =858369a(14) =1438728a(15) =2990881a(16) =6452304a(17) =11431783a(18) =21757610a(19) =47174513a(20) =89535600a(21) =163551107a(22) =342222086a(23) =684851725a(24) =1254030304a(25) =2502106475a(26) =5132607276

External references