Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.

A260172

Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001.

Terms

    a(0) =183a(1) =419a(2) =1054a(3) =2598a(4) =6813a(5) =17889a(6) =46263a(7) =119681a(8) =316052a(9) =821743a(10) =2142670a(11) =5594790a(12) =14648190a(13) =38111650a(14) =99634628a(15) =260110994a(16) =679357192a(17) =1771602718a(18) =4630032186a(19) =12081675926a(20) =31547816516a(21) =82338811496a(22) =215053875128a(23) =561241973258

External references