Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

A260500

Number of (n+2)X(7+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

Terms

    a(0) =3446a(1) =4393a(2) =11450a(3) =22405a(4) =30590a(5) =67993a(6) =155232a(7) =238047a(8) =464696a(9) =1101861a(10) =1918174a(11) =3455378a(12) =7911060a(13) =15278603a(14) =27003724a(15) =57946329a(16) =118720366a(17) =215170020a(18) =434883634a(19) =908857723a(20) =1710433300a(21) =3334349545a(22) =6924650180a(23) =13468317384

External references