Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111.

A261705

Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111.

Terms

    a(0) =76a(1) =134a(2) =270a(3) =462a(4) =892a(5) =1751a(6) =3299a(7) =6324a(8) =12389a(9) =23874a(10) =46352a(11) =90232a(12) =175147a(13) =340107a(14) =662278a(15) =1287201a(16) =2502792a(17) =4868654a(18) =9469734a(19) =18415483a(20) =35823639a(21) =69677328a(22) =135524601a(23) =263610130a(24) =512755352a(25) =997337880a(26) =1939945931a(27) =3773395523

External references