Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

A260493

Number of (n+2)X(n+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

Terms

    a(0) =48a(1) =136a(2) =868a(3) =3603a(4) =5848a(5) =31078a(6) =155232a(7) =356236a(8) =1433220a(9) =8676027a(10) =28104408a(11) =96675895a(12) =569988256a(13) =2581001066a(14) =9580891800a(15) =49283809387a(16) =267771460624

External references