Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010101.

A260471

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010101.

Terms

    a(0) =205a(1) =471a(2) =1723a(3) =5034a(4) =15502a(5) =51552a(6) =161176a(7) =500384a(8) =1604536a(9) =5086798a(10) =15970826a(11) =50628404a(12) =160518794a(13) =506646020a(14) =1602247622a(15) =5073114544a(16) =16039699386a(17) =50717541826a(18) =160468331560a(19) =507552451076

External references