Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.

A260242

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.

Terms

    a(0) =99a(1) =213a(2) =551a(3) =1235a(4) =3026a(5) =7822a(6) =18837a(7) =45114a(8) =113177a(9) =278981a(10) =673881a(11) =1658848a(12) =4103482a(13) =10010581a(14) =24491986a(15) =60359993a(16) =148047597a(17) =362209985a(18) =889739556a(19) =2185247654a(20) =5354240443a(21) =13133074594a(22) =32246360727a(23) =79089150691a(24) =193945475731

External references