Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.

A261260

Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 00100101 or 01010101.

Terms

    a(0) =91a(1) =110a(2) =288a(3) =690a(4) =1483a(5) =2948a(6) =6795a(7) =14292a(8) =32297a(9) =66828a(10) =151277a(11) =315528a(12) =713289a(13) =1485412a(14) =3353269a(15) =6999606a(16) =15784789a(17) =32971814a(18) =74265077a(19) =155329758a(20) =349486647a(21) =731717900a(22) =1644547773a(23) =3446906988a(24) =7738976061a(25) =16237071190a(26) =36418432025

External references